21400226749360 has 20 divisors (see below), whose sum is σ = 49755527192448. Its totient is φ = 8560090699712.

The previous prime is 21400226749339. The next prime is 21400226749399. The reversal of 21400226749360 is 6394762200412.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 21400226749360.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133751417104 + ... + 133751417263.

Almost surely, 2^{21400226749360} is an apocalyptic number.

21400226749360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21400226749360 is an abundant number, since it is smaller than the sum of its proper divisors (28355300443088).

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

21400226749360 is a wasteful number, since it uses less digits than its factorization.

21400226749360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267502834380 (or 267502834374 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 46.

Adding to 21400226749360 its reverse (6394762200412), we get a palindrome (27794988949772).

The spelling of 21400226749360 in words is "twenty-one trillion, four hundred billion, two hundred twenty-six million, seven hundred forty-nine thousand, three hundred sixty".