21621210426610 has 16 divisors (see below), whose sum is σ = 38918366208576. Its totient is φ = 8648442517168.

The previous prime is 21621210426577. The next prime is 21621210426631. The reversal of 21621210426610 is 1662401212612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2981284 + ... + 7220143.

It is an arithmetic number, because the mean of its divisors is an integer number (2432397888036).

Almost surely, 2^{21621210426610} is an apocalyptic number.

21621210426610 is a deficient number, since it is larger than the sum of its proper divisors (17297155781966).

21621210426610 is a wasteful number, since it uses less digits than its factorization.

21621210426610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10413377.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 21621210426610 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred ten million, four hundred twenty-six thousand, six hundred ten".