21346899640 has 32 divisors (see below), whose sum is σ = 52396936560. Its totient is φ = 7762508800.

The previous prime is 21346899631. The next prime is 21346899641. The reversal of 21346899640 is 4699864312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346899641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24257401 + ... + 24258280.

Almost surely, 2^21346899640 is an apocalyptic number.

21346899640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21346899640 is an abundant number, since it is smaller than the sum of its proper divisors (31050036920).

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

21346899640 is a wasteful number, since it uses less digits than its factorization.

21346899640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48515703 (or 48515699 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 21346899640 in words is "twenty-one billion, three hundred forty-six million, eight hundred ninety-nine thousand, six hundred forty".