21142220224 has 28 divisors (see below), whose sum is σ = 43307455168. Its totient is φ = 10230105600.

The previous prime is 21142220219. The next prime is 21142220237. The reversal of 21142220224 is 42202224112.

It is a super-2 number, since 2×21142220224² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21142220195 and 21142220204.

It is a congruent number.

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, 5326197 + ... + 5330164.

Almost surely, 2^21142220224 is an apocalyptic number.

It is an amenable number.

21142220224 is an abundant number, since it is smaller than the sum of its proper divisors (22165234944).

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

21142220224 is a wasteful number, since it uses less digits than its factorization.

21142220224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10656404 (or 10656394 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21142220224 its reverse (42202224112), we get a palindrome (63344444336).

The spelling of 21142220224 in words is "twenty-one billion, one hundred forty-two million, two hundred twenty thousand, two hundred twenty-four".