21315655310 has 8 divisors (see below), whose sum is σ = 38368179576. Its totient is φ = 8526262120.

The previous prime is 21315655247. The next prime is 21315655321. The reversal of 21315655310 is 1355651312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21315655310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065782756 + ... + 1065782775.

It is an arithmetic number, because the mean of its divisors is an integer number (4796022447).

Almost surely, 2^21315655310 is an apocalyptic number.

21315655310 is a deficient number, since it is larger than the sum of its proper divisors (17052524266).

21315655310 is a wasteful number, since it uses less digits than its factorization.

21315655310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131565538.

The product of its (nonzero) digits is 13500, while the sum is 32.

The spelling of 21315655310 in words is "twenty-one billion, three hundred fifteen million, six hundred fifty-five thousand, three hundred ten".