21495269136 has 160 divisors (see below), whose sum is σ = 61596057600. Its totient is φ = 6405143040.

The previous prime is 21495269119. The next prime is 21495269141. The reversal of 21495269136 is 63196259412.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7998385 + ... + 8001071.

It is an arithmetic number, because the mean of its divisors is an integer number (384975360).

Almost surely, 2^21495269136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21495269136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30798028800).

21495269136 is an abundant number, since it is smaller than the sum of its proper divisors (40100788464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21495269136 is a wasteful number, since it uses less digits than its factorization.

21495269136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957 (or 2951 counting only the distinct ones).

The product of its digits is 699840, while the sum is 48.

The spelling of 21495269136 in words is "twenty-one billion, four hundred ninety-five million, two hundred sixty-nine thousand, one hundred thirty-six".