21294835260 has 96 divisors (see below), whose sum is σ = 60666242112. Its totient is φ = 5579704320.

The previous prime is 21294835259. The next prime is 21294835277. The reversal of 21294835260 is 6253849212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4363942 + ... + 4368818.

It is an arithmetic number, because the mean of its divisors is an integer number (631940022).

Almost surely, 2^21294835260 is an apocalyptic number.

21294835260 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 21294835260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30333121056).

21294835260 is an abundant number, since it is smaller than the sum of its proper divisors (39371406852).

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

21294835260 is a wasteful number, since it uses less digits than its factorization.

21294835260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6143 (or 6141 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21294835260 in words is "twenty-one billion, two hundred ninety-four million, eight hundred thirty-five thousand, two hundred sixty".