21203202124 has 48 divisors (see below), whose sum is σ = 40180928256. Its totient is φ = 9732096000.

The previous prime is 21203202067. The next prime is 21203202131. The reversal of 21203202124 is 42120230212.

It is a super-2 number, since 2×21203202124² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13242924 + ... + 13244524.

It is an arithmetic number, because the mean of its divisors is an integer number (837102672).

Almost surely, 2^21203202124 is an apocalyptic number.

It is an amenable number.

21203202124 is a deficient number, since it is larger than the sum of its proper divisors (18977726132).

21203202124 is a wasteful number, since it uses less digits than its factorization.

21203202124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866 (or 2864 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21203202124 its reverse (42120230212), we get a palindrome (63323432336).

The spelling of 21203202124 in words is "twenty-one billion, two hundred three million, two hundred two thousand, one hundred twenty-four".