21321420124 has 12 divisors (see below), whose sum is σ = 37313535448. Its totient is φ = 10660410000.

The previous prime is 21321420079. The next prime is 21321420149. The reversal of 21321420124 is 42102412312.

It is a super-2 number, since 2×21321420124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321420095 and 21321420104.

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, 184999 + ... + 277249.

Almost surely, 2^21321420124 is an apocalyptic number.

It is an amenable number.

21321420124 is a deficient number, since it is larger than the sum of its proper divisors (15992115324).

21321420124 is a wasteful number, since it uses less digits than its factorization.

21321420124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150036 (or 150034 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21321420124 its reverse (42102412312), we get a palindrome (63423832436).

The spelling of 21321420124 in words is "twenty-one billion, three hundred twenty-one million, four hundred twenty thousand, one hundred twenty-four".