21247064115 has 32 divisors (see below), whose sum is σ = 35108990976. Its totient is φ = 10960894080.

The previous prime is 21247064093. The next prime is 21247064173. The reversal of 21247064115 is 51146074212.

It is not a de Polignac number, because 21247064115 - 2¹² = 21247060019 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1056282 + ... + 1076208.

It is an arithmetic number, because the mean of its divisors is an integer number (1097155968).

Almost surely, 2^21247064115 is an apocalyptic number.

21247064115 is a deficient number, since it is larger than the sum of its proper divisors (13861926861).

21247064115 is a wasteful number, since it uses less digits than its factorization.

21247064115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22259.

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 21247064115 in words is "twenty-one billion, two hundred forty-seven million, sixty-four thousand, one hundred fifteen".