21316234260 has 48 divisors (see below), whose sum is σ = 61610798592. Its totient is φ = 5500963200.

The previous prime is 21316234249. The next prime is 21316234309. The reversal of 21316234260 is 6243261312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5728311 + ... + 5732030.

It is an arithmetic number, because the mean of its divisors is an integer number (1283558304).

Almost surely, 2^21316234260 is an apocalyptic number.

21316234260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21316234260 is an abundant number, since it is smaller than the sum of its proper divisors (40294564332).

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

21316234260 is a wasteful number, since it uses less digits than its factorization.

21316234260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11460384 (or 11460382 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 21316234260 its reverse (6243261312), we get a palindrome (27559495572).

The spelling of 21316234260 in words is "twenty-one billion, three hundred sixteen million, two hundred thirty-four thousand, two hundred sixty".