21222432124 has 12 divisors (see below), whose sum is σ = 37227897000. Its totient is φ = 10585890128.

The previous prime is 21222432113. The next prime is 21222432131. The reversal of 21222432124 is 42123422212.

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, 6329599 + ... + 6332950.

It is an arithmetic number, because the mean of its divisors is an integer number (3102324750).

Almost surely, 2^21222432124 is an apocalyptic number.

It is an amenable number.

21222432124 is a deficient number, since it is larger than the sum of its proper divisors (16005464876).

21222432124 is a wasteful number, since it uses less digits than its factorization.

21222432124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12662972 (or 12662970 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

Adding to 21222432124 its reverse (42123422212), we get a palindrome (63345854336).

The spelling of 21222432124 in words is "twenty-one billion, two hundred twenty-two million, four hundred thirty-two thousand, one hundred twenty-four".