21752521826 has 16 divisors (see below), whose sum is σ = 37293494784. Its totient is φ = 9321645024.

The previous prime is 21752521807. The next prime is 21752521867. The reversal of 21752521826 is 62812525712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98246 + ... + 230558.

It is an arithmetic number, because the mean of its divisors is an integer number (2330843424).

Almost surely, 2^21752521826 is an apocalyptic number.

21752521826 is a deficient number, since it is larger than the sum of its proper divisors (15540972958).

21752521826 is a wasteful number, since it uses less digits than its factorization.

21752521826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144065.

The product of its digits is 134400, while the sum is 41.

The spelling of 21752521826 in words is "twenty-one billion, seven hundred fifty-two million, five hundred twenty-one thousand, eight hundred twenty-six".