21122102997 has 8 divisors (see below), whose sum is σ = 31292004480. Its totient is φ = 14081401980.

The previous prime is 21122102987. The next prime is 21122103007. The reversal of 21122102997 is 79920122112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21122102987) and next prime (21122103007).

It is not a de Polignac number, because 21122102997 - 2⁸ = 21122102741 is a prime.

It is a super-2 number, since 2×21122102997² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122102927) 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, 391150029 + ... + 391150082.

It is an arithmetic number, because the mean of its divisors is an integer number (3911500560).

Almost surely, 2^21122102997 is an apocalyptic number.

21122102997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21122102997 is a deficient number, since it is larger than the sum of its proper divisors (10169901483).

21122102997 is an equidigital number, since it uses as much as digits as its factorization.

21122102997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782300120 (or 782300114 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 21122102997 in words is "twenty-one billion, one hundred twenty-two million, one hundred two thousand, nine hundred ninety-seven".