21340667904 has 120 divisors (see below), whose sum is σ = 57085356720. Its totient is φ = 7091257344.

The previous prime is 21340667903. The next prime is 21340667911. The reversal of 21340667904 is 40976604312.

It is not an unprimeable number, because it can be changed into a prime (21340667903) 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, 25017942 + ... + 25018794.

It is an arithmetic number, because the mean of its divisors is an integer number (475711306).

Almost surely, 2^21340667904 is an apocalyptic number.

21340667904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21340667904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28542678360).

21340667904 is an abundant number, since it is smaller than the sum of its proper divisors (35744688816).

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

21340667904 is an frugal number, since it uses more digits than its factorization.

21340667904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1367 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 21340667904 in words is "twenty-one billion, three hundred forty million, six hundred sixty-seven thousand, nine hundred four".