21012610423 has 16 divisors (see below), whose sum is σ = 24323604480. Its totient is φ = 17779270176.

The previous prime is 21012610373. The next prime is 21012610477. The reversal of 21012610423 is 32401621012.

It is a cyclic number.

It is not a de Polignac number, because 21012610423 - 2⁹ = 21012609911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21012610394 and 21012610403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012614423) 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, 728961 + ... + 757237.

It is an arithmetic number, because the mean of its divisors is an integer number (1520225280).

Almost surely, 2^21012610423 is an apocalyptic number.

21012610423 is a deficient number, since it is larger than the sum of its proper divisors (3310994057).

21012610423 is a wasteful number, since it uses less digits than its factorization.

21012610423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29646.

The product of its (nonzero) digits is 576, while the sum is 22.

The spelling of 21012610423 in words is "twenty-one billion, twelve million, six hundred ten thousand, four hundred twenty-three".