21002032124 has 6 divisors (see below), whose sum is σ = 36753556224. Its totient is φ = 10501016060.

The previous prime is 21002032111. The next prime is 21002032127. The reversal of 21002032124 is 42123020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002032127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625254012 + ... + 2625254019.

It is an arithmetic number, because the mean of its divisors is an integer number (6125592704).

Almost surely, 2^21002032124 is an apocalyptic number.

It is an amenable number.

21002032124 is a deficient number, since it is larger than the sum of its proper divisors (15751524100).

21002032124 is a wasteful number, since it uses less digits than its factorization.

21002032124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250508035 (or 5250508033 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21002032124 its reverse (42123020012), we get a palindrome (63125052136).

The spelling of 21002032124 in words is "twenty-one billion, two million, thirty-two thousand, one hundred twenty-four".