21260390112 has 240 divisors, whose sum is σ = 68013503712. Its totient is φ = 6475852800.

The previous prime is 21260390093. The next prime is 21260390149. The reversal of 21260390112 is 21109306212.

21260390112 is a `hidden beast` number, since 2 + 1 + 260 + 390 + 1 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3400173 + ... + 3406419.

Almost surely, 2^21260390112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21260390112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34006751856).

21260390112 is an abundant number, since it is smaller than the sum of its proper divisors (46753113600).

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

21260390112 is a wasteful number, since it uses less digits than its factorization.

21260390112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6383 (or 6366 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Adding to 21260390112 its reverse (21109306212), we get a palindrome (42369696324).

The spelling of 21260390112 in words is "twenty-one billion, two hundred sixty million, three hundred ninety thousand, one hundred twelve".