21260452818 has 16 divisors (see below), whose sum is σ = 46386442656. Its totient is φ = 6442561440.

The previous prime is 21260452813. The next prime is 21260452831. The reversal of 21260452818 is 81825406212.

It is a happy number.

It is a super-2 number, since 2×21260452818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21260452813) 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, 161063971 + ... + 161064102.

It is an arithmetic number, because the mean of its divisors is an integer number (2899152666).

Almost surely, 2^21260452818 is an apocalyptic number.

21260452818 is an abundant number, since it is smaller than the sum of its proper divisors (25125989838).

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

21260452818 is a wasteful number, since it uses less digits than its factorization.

21260452818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322128089.

The product of its (nonzero) digits is 61440, while the sum is 39.

The spelling of 21260452818 in words is "twenty-one billion, two hundred sixty million, four hundred fifty-two thousand, eight hundred eighteen".