1213022121 has 8 divisors (see below), whose sum is σ = 1673134080. Its totient is φ = 780795792.

The previous prime is 1213022101. The next prime is 1213022143. The reversal of 1213022121 is 1212203121.

1213022121 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1213022121 - 2⁵ = 1213022089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213022121.

It is not an unprimeable number, because it can be changed into a prime (1213022101) 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, 6971305 + ... + 6971478.

It is an arithmetic number, because the mean of its divisors is an integer number (209141760).

Almost surely, 2^1213022121 is an apocalyptic number.

It is an amenable number.

1213022121 is a deficient number, since it is larger than the sum of its proper divisors (460111959).

1213022121 is a wasteful number, since it uses less digits than its factorization.

1213022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13942815.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1213022121 is about 34828.4671066643. The cubic root of 1213022121 is about 1066.4886559171.

Adding to 1213022121 its reverse (1212203121), we get a palindrome (2425225242).

The spelling of 1213022121 in words is "one billion, two hundred thirteen million, twenty-two thousand, one hundred twenty-one".