1022121221 has 8 divisors (see below), whose sum is σ = 1125868224. Its totient is φ = 920178720.

The previous prime is 1022121203. The next prime is 1022121239. The reversal of 1022121221 is 1221212201.

1022121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1022121203) and next prime (1022121239).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022121221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022121196 and 1022121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022121281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449936 + ... + 452201.

It is an arithmetic number, because the mean of its divisors is an integer number (140733528).

Almost surely, 2^1022121221 is an apocalyptic number.

1022121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1022121221 is a deficient number, since it is larger than the sum of its proper divisors (103747003).

1022121221 is a wasteful number, since it uses less digits than its factorization.

1022121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902251.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1022121221 is about 31970.6306005997. The cubic root of 1022121221 is about 1007.3200267985.

Adding to 1022121221 its reverse (1221212201), we get a palindrome (2243333422).

The spelling of 1022121221 in words is "one billion, twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".