99401260021 has 16 divisors (see below), whose sum is σ = 115606771200. Its totient is φ = 83699079408.

The previous prime is 99401259989. The next prime is 99401260027. The reversal of 99401260021 is 12006210499.

It is not a de Polignac number, because 99401260021 - 2⁵ = 99401259989 is a prime.

It is a super-2 number, since 2×99401260021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99401260027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520086 + ... + 685048.

It is an arithmetic number, because the mean of its divisors is an integer number (7225423200).

Almost surely, 2^99401260021 is an apocalyptic number.

It is an amenable number.

99401260021 is a deficient number, since it is larger than the sum of its proper divisors (16205511179).

99401260021 is a wasteful number, since it uses less digits than its factorization.

99401260021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166488.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 99401260021 in words is "ninety-nine billion, four hundred one million, two hundred sixty thousand, twenty-one".