1022121981 has 12 divisors (see below), whose sum is σ = 1485458208. Its totient is φ = 677233224.

The previous prime is 1022121977. The next prime is 1022122021. The reversal of 1022121981 is 1891212201.

It is not a de Polignac number, because 1022121981 - 2² = 1022121977 is a prime.

It is a super-2 number, since 2×1022121981² = 2089466688086728722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022121941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346905 + ... + 349838.

It is an arithmetic number, because the mean of its divisors is an integer number (123788184).

Almost surely, 2^1022121981 is an apocalyptic number.

It is an amenable number.

1022121981 is a deficient number, since it is larger than the sum of its proper divisors (463336227).

1022121981 is a wasteful number, since it uses less digits than its factorization.

1022121981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696912 (or 696909 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1022121981 is about 31970.6424865063. The cubic root of 1022121981 is about 1007.3202764633.

The spelling of 1022121981 in words is "one billion, twenty-two million, one hundred twenty-one thousand, nine hundred eighty-one".