21426562430 has 128 divisors (see below), whose sum is σ = 48065052672. Its totient is φ = 6696442368.

The previous prime is 21426562343. The next prime is 21426562457. The reversal of 21426562430 is 3426562412.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45881057 + ... + 45881523.

It is an arithmetic number, because the mean of its divisors is an integer number (375508224).

Almost surely, 2^21426562430 is an apocalyptic number.

21426562430 is an abundant number, since it is smaller than the sum of its proper divisors (26638490242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21426562430 is a wasteful number, since it uses less digits than its factorization.

21426562430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 21426562430 in words is "twenty-one billion, four hundred twenty-six million, five hundred sixty-two thousand, four hundred thirty".