1021021101221 has 8 divisors (see below), whose sum is σ = 1114476613824. Its totient is φ = 927671490720.

The previous prime is 1021021101211. The next prime is 1021021101227. The reversal of 1021021101221 is 1221011201201.

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

It is a cyclic number.

It is not a de Polignac number, because 1021021101221 - 2⁶ = 1021021101157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021021101196 and 1021021101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021101227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26455361 + ... + 26493926.

It is an arithmetic number, because the mean of its divisors is an integer number (139309576728).

Almost surely, 2^{1021021101221} is an apocalyptic number.

1021021101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021021101221 is a deficient number, since it is larger than the sum of its proper divisors (93455512603).

1021021101221 is a wasteful number, since it uses less digits than its factorization.

1021021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52951051.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021021101221 its reverse (1221011201201), we get a palindrome (2242032302422).

The spelling of 1021021101221 in words is "one trillion, twenty-one billion, twenty-one million, one hundred one thousand, two hundred twenty-one".