21005152313200 has 60 divisors (see below), whose sum is σ = 55052594665128. Its totient is φ = 7638237203200.

The previous prime is 21005152313153. The next prime is 21005152313227. The reversal of 21005152313200 is 231325150012.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2386944727 + ... + 2386953526.

Almost surely, 2^{21005152313200} is an apocalyptic number.

21005152313200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21005152313200 is an abundant number, since it is smaller than the sum of its proper divisors (34047442351928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21005152313200 is a wasteful number, since it uses less digits than its factorization.

21005152313200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4773898282 (or 4773898271 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21005152313200 its reverse (231325150012), we get a palindrome (21236477463212).

The spelling of 21005152313200 in words is "twenty-one trillion, five billion, one hundred fifty-two million, three hundred thirteen thousand, two hundred".