21402222124 has 6 divisors (see below), whose sum is σ = 37453888724. Its totient is φ = 10701111060.

The previous prime is 21402222113. The next prime is 21402222137. The reversal of 21402222124 is 42122220412.

It is a super-2 number, since 2×21402222124² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21402222095 and 21402222104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675277762 + ... + 2675277769.

Almost surely, 2^21402222124 is an apocalyptic number.

It is an amenable number.

21402222124 is a deficient number, since it is larger than the sum of its proper divisors (16051666600).

21402222124 is a wasteful number, since it uses less digits than its factorization.

21402222124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350555535 (or 5350555533 counting only the distinct ones).

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

Adding to 21402222124 its reverse (42122220412), we get a palindrome (63524442536).

The spelling of 21402222124 in words is "twenty-one billion, four hundred two million, two hundred twenty-two thousand, one hundred twenty-four".