81000121022022 has 32 divisors (see below), whose sum is σ = 162491315220864. Its totient is φ = 26918196465600.

The previous prime is 81000121021991. The next prime is 81000121022053. The reversal of 81000121022022 is 22022012100018.

It is an interprime number because it is at equal distance from previous prime (81000121021991) and next prime (81000121022053).

It is a super-2 number, since 2×81000121022022² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81000121022022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323408122 + ... + 323658482.

It is an arithmetic number, because the mean of its divisors is an integer number (5077853600652).

Almost surely, 2^{81000121022022} is an apocalyptic number.

81000121022022 is an abundant number, since it is smaller than the sum of its proper divisors (81491194198842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81000121022022 is a wasteful number, since it uses less digits than its factorization.

81000121022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413604.

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 81000121022022 in words is "eighty-one trillion, one hundred twenty-one million, twenty-two thousand, twenty-two".