21400561095 has 16 divisors (see below), whose sum is σ = 36255068640. Its totient is φ = 10742242304.

The previous prime is 21400561087. The next prime is 21400561097. The reversal of 21400561095 is 59016500412.

It is a cyclic number.

It is not a de Polignac number, because 21400561095 - 2³ = 21400561087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400561097) 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, 41961630 + ... + 41962139.

It is an arithmetic number, because the mean of its divisors is an integer number (2265941790).

Almost surely, 2^21400561095 is an apocalyptic number.

21400561095 is a deficient number, since it is larger than the sum of its proper divisors (14854507545).

21400561095 is a wasteful number, since it uses less digits than its factorization.

21400561095 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83923794.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 21400561095 in words is "twenty-one billion, four hundred million, five hundred sixty-one thousand, ninety-five".