21616231221403 has 48 divisors (see below), whose sum is σ = 28374305230656. Its totient is φ = 16291461795840.

The previous prime is 21616231221371. The next prime is 21616231221407. The reversal of 21616231221403 is 30412213261612.

It is not a de Polignac number, because 21616231221403 - 2⁵ = 21616231221371 is a prime.

It is a super-2 number, since 2×21616231221403² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21616231221407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 469875 + ... + 6591907.

It is an arithmetic number, because the mean of its divisors is an integer number (591131358972).

Almost surely, 2^{21616231221403} is an apocalyptic number.

21616231221403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21616231221403 is a deficient number, since it is larger than the sum of its proper divisors (6758074009253).

21616231221403 is a wasteful number, since it uses less digits than its factorization.

21616231221403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6122324 (or 6122317 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21616231221403 in words is "twenty-one trillion, six hundred sixteen billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred three".