21406740802 has 16 divisors (see below), whose sum is σ = 32197849920. Its totient is φ = 10674147952.

The previous prime is 21406740793. The next prime is 21406740809. The reversal of 21406740802 is 20804760412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21406740809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2466723 + ... + 2475385.

It is an arithmetic number, because the mean of its divisors is an integer number (2012365620).

Almost surely, 2^21406740802 is an apocalyptic number.

21406740802 is a deficient number, since it is larger than the sum of its proper divisors (10791109118).

21406740802 is a wasteful number, since it uses less digits than its factorization.

21406740802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11897.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 21406740802 in words is "twenty-one billion, four hundred six million, seven hundred forty thousand, eight hundred two".