21540606562 has 4 divisors (see below), whose sum is σ = 32310909846. Its totient is φ = 10770303280.

The previous prime is 21540606557. The next prime is 21540606583. The reversal of 21540606562 is 26560604512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11193851601 + 10346754961 = 105801^2 + 101719^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5385151639 + ... + 5385151642.

Almost surely, 2^21540606562 is an apocalyptic number.

21540606562 is a deficient number, since it is larger than the sum of its proper divisors (10770303284).

21540606562 is a wasteful number, since it uses less digits than its factorization.

21540606562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770303283.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21540606562 in words is "twenty-one billion, five hundred forty million, six hundred six thousand, five hundred sixty-two".