21277730710 has 32 divisors (see below), whose sum is σ = 39575008512. Its totient is φ = 8228288640.

The previous prime is 21277730707. The next prime is 21277730717. The reversal of 21277730710 is 1703777212.

It is a self number, because there is not a number n which added to its sum of digits gives 21277730710.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21277730717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280152 + ... + 347908.

It is an arithmetic number, because the mean of its divisors is an integer number (1236719016).

Almost surely, 2^21277730710 is an apocalyptic number.

21277730710 is a deficient number, since it is larger than the sum of its proper divisors (18297277802).

21277730710 is a wasteful number, since it uses less digits than its factorization.

21277730710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68808.

The product of its (nonzero) digits is 28812, while the sum is 37.

The spelling of 21277730710 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred thirty thousand, seven hundred ten".