21616621402063 has 16 divisors (see below), whose sum is σ = 22713085584000. Its totient is φ = 20552604517120.

The previous prime is 21616621402031. The next prime is 21616621402099. The reversal of 21616621402063 is 36020412661612.

It is a cyclic number.

It is not a de Polignac number, because 21616621402063 - 2⁵ = 21616621402031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616621402963) 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, 33058183 + ... + 33705736.

It is an arithmetic number, because the mean of its divisors is an integer number (1419567849000).

Almost surely, 2^{21616621402063} is an apocalyptic number.

21616621402063 is a deficient number, since it is larger than the sum of its proper divisors (1096464181937).

21616621402063 is a wasteful number, since it uses less digits than its factorization.

21616621402063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66764162.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 21616621402063 in words is "twenty-one trillion, six hundred sixteen billion, six hundred twenty-one million, four hundred two thousand, sixty-three".