21655225122026 has 32 divisors (see below), whose sum is σ = 32965319761920. Its totient is φ = 10668131308800.

The previous prime is 21655225122019. The next prime is 21655225122053. The reversal of 21655225122026 is 62022152255612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32727746 + ... + 33382866.

It is an arithmetic number, because the mean of its divisors is an integer number (1030166242560).

Almost surely, 2^{21655225122026} is an apocalyptic number.

21655225122026 is a deficient number, since it is larger than the sum of its proper divisors (11310094639894).

21655225122026 is a wasteful number, since it uses less digits than its factorization.

21655225122026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656150.

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 21655225122026 its reverse (62022152255612), we get a palindrome (83677377377638).

The spelling of 21655225122026 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twenty-five million, one hundred twenty-two thousand, twenty-six".