21521350604 has 12 divisors (see below), whose sum is σ = 40559468544. Its totient is φ = 9932931024.

The previous prime is 21521350577. The next prime is 21521350633. The reversal of 21521350604 is 40605312512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206936012 + ... + 206936115.

It is an arithmetic number, because the mean of its divisors is an integer number (3379955712).

Almost surely, 2^21521350604 is an apocalyptic number.

It is an amenable number.

21521350604 is a deficient number, since it is larger than the sum of its proper divisors (19038117940).

21521350604 is a wasteful number, since it uses less digits than its factorization.

21521350604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413872144 (or 413872142 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21521350604 in words is "twenty-one billion, five hundred twenty-one million, three hundred fifty thousand, six hundred four".