21150421204 has 24 divisors (see below), whose sum is σ = 40470091200. Its totient is φ = 9591919680.

The previous prime is 21150421199. The next prime is 21150421219. The reversal of 21150421204 is 40212405112.

It is a super-2 number, since 2×21150421204² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528169 + ... + 566800.

It is an arithmetic number, because the mean of its divisors is an integer number (1686253800).

Almost surely, 2^21150421204 is an apocalyptic number.

It is an amenable number.

21150421204 is a deficient number, since it is larger than the sum of its proper divisors (19319669996).

21150421204 is a wasteful number, since it uses less digits than its factorization.

21150421204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095423 (or 1095421 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21150421204 its reverse (40212405112), we get a palindrome (61362826316).

The spelling of 21150421204 in words is "twenty-one billion, one hundred fifty million, four hundred twenty-one thousand, two hundred four".