21400733406 has 16 divisors (see below), whose sum is σ = 46093887504. Its totient is φ = 6584841024.

The previous prime is 21400733399. The next prime is 21400733411. The reversal of 21400733406 is 60433700412.

It is a congruent number.

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, 137184111 + ... + 137184266.

It is an arithmetic number, because the mean of its divisors is an integer number (2880867969).

Almost surely, 2^21400733406 is an apocalyptic number.

21400733406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21400733406 is an abundant number, since it is smaller than the sum of its proper divisors (24693154098).

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

21400733406 is a wasteful number, since it uses less digits than its factorization.

21400733406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274368395.

The product of its (nonzero) digits is 12096, while the sum is 30.

The spelling of 21400733406 in words is "twenty-one billion, four hundred million, seven hundred thirty-three thousand, four hundred six".