21270420260 has 48 divisors (see below), whose sum is σ = 45314640000. Its totient is φ = 8385156864.

The previous prime is 21270420221. The next prime is 21270420271. The reversal of 21270420260 is 6202407212.

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, 2183681 + ... + 2193399.

It is an arithmetic number, because the mean of its divisors is an integer number (944055000).

Almost surely, 2^21270420260 is an apocalyptic number.

21270420260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21270420260 is an abundant number, since it is smaller than the sum of its proper divisors (24044219740).

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

21270420260 is a wasteful number, since it uses less digits than its factorization.

21270420260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11300 (or 11298 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

Adding to 21270420260 its reverse (6202407212), we get a palindrome (27472827472).

The spelling of 21270420260 in words is "twenty-one billion, two hundred seventy million, four hundred twenty thousand, two hundred sixty".