21012424304 has 10 divisors (see below), whose sum is σ = 40711572120. Its totient is φ = 10506212144.

The previous prime is 21012424297. The next prime is 21012424331. The reversal of 21012424304 is 40342421012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012424304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656638244 + ... + 656638275.

It is an arithmetic number, because the mean of its divisors is an integer number (4071157212).

Almost surely, 2^21012424304 is an apocalyptic number.

It is an amenable number.

21012424304 is a deficient number, since it is larger than the sum of its proper divisors (19699147816).

21012424304 is a wasteful number, since it uses less digits than its factorization.

21012424304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313276527 (or 1313276521 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21012424304 its reverse (40342421012), we get a palindrome (61354845316).

The spelling of 21012424304 in words is "twenty-one billion, twelve million, four hundred twenty-four thousand, three hundred four".