21221428095 has 96 divisors (see below), whose sum is σ = 42467338368. Its totient is φ = 9602740224.

The previous prime is 21221428051. The next prime is 21221428097. The reversal of 21221428095 is 59082412212.

21221428095 is a `hidden beast` number, since 2 + 1 + 221 + 428 + 0 + 9 + 5 = 666.

It is not a de Polignac number, because 21221428095 - 2¹¹ = 21221426047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221428097) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 26626237 + ... + 26627033.

It is an arithmetic number, because the mean of its divisors is an integer number (442368108).

Almost surely, 2^21221428095 is an apocalyptic number.

21221428095 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21221428095 is a wasteful number, since it uses less digits than its factorization.

21221428095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 21221428095 in words is "twenty-one billion, two hundred twenty-one million, four hundred twenty-eight thousand, ninety-five".