21652621642 has 32 divisors (see below), whose sum is σ = 34975670400. Its totient is φ = 10016616960.

The previous prime is 21652621631. The next prime is 21652621687. The reversal of 21652621642 is 24612625612.

It is a happy number.

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, 824734 + ... + 850582.

It is an arithmetic number, because the mean of its divisors is an integer number (1092989700).

Almost surely, 2^21652621642 is an apocalyptic number.

21652621642 is a deficient number, since it is larger than the sum of its proper divisors (13323048758).

21652621642 is a wasteful number, since it uses less digits than its factorization.

21652621642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26286.

The product of its digits is 69120, while the sum is 37.

The spelling of 21652621642 in words is "twenty-one billion, six hundred fifty-two million, six hundred twenty-one thousand, six hundred forty-two".