21225214404 has 30 divisors (see below), whose sum is σ = 55486903934. Its totient is φ = 7075071360.

The previous prime is 21225214397. The next prime is 21225214427. The reversal of 21225214404 is 40441252212.

It is a happy number.

21225214404 is a `hidden beast` number, since 2 + 1 + 2 + 252 + 1 + 4 + 404 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19712160000 + 1513054404 = 140400^2 + 38898^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32754637 + ... + 32755284.

Almost surely, 2^21225214404 is an apocalyptic number.

It is an amenable number.

21225214404 is an abundant number, since it is smaller than the sum of its proper divisors (34261689530).

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

21225214404 is a wasteful number, since it uses less digits than its factorization.

21225214404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65509937 (or 65509926 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 21225214404 its reverse (40441252212), we get a palindrome (61666466616).

The spelling of 21225214404 in words is "twenty-one billion, two hundred twenty-five million, two hundred fourteen thousand, four hundred four".