21214436202456 has 128 divisors (see below), whose sum is σ = 61143506588160. Its totient is φ = 6008312448000.

The previous prime is 21214436202383. The next prime is 21214436202481. The reversal of 21214436202456 is 65420263441212.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15237106 + ... + 16571006.

It is an arithmetic number, because the mean of its divisors is an integer number (477683645220).

Almost surely, 2^{21214436202456} 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 21214436202456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30571753294080).

21214436202456 is an abundant number, since it is smaller than the sum of its proper divisors (39929070385704).

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

21214436202456 is a wasteful number, since it uses less digits than its factorization.

21214436202456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334745 (or 1334741 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

Adding to 21214436202456 its reverse (65420263441212), we get a palindrome (86634699643668).

The spelling of 21214436202456 in words is "twenty-one trillion, two hundred fourteen billion, four hundred thirty-six million, two hundred two thousand, four hundred fifty-six".