21400739080 has 128 divisors (see below), whose sum is σ = 57294086400. Its totient is φ = 7038839808.

The previous prime is 21400739033. The next prime is 21400739081. The reversal of 21400739080 is 8093700412.

It is not an unprimeable number, because it can be changed into a prime (21400739081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1266447 + ... + 1283233.

It is an arithmetic number, because the mean of its divisors is an integer number (447610050).

Almost surely, 2^21400739080 is an apocalyptic number.

21400739080 is a gapful number since it is divisible by the number (20) 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 21400739080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28647043200).

21400739080 is an abundant number, since it is smaller than the sum of its proper divisors (35893347320).

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

21400739080 is a wasteful number, since it uses less digits than its factorization.

21400739080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16991 (or 16987 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The spelling of 21400739080 in words is "twenty-one billion, four hundred million, seven hundred thirty-nine thousand, eighty".