21047412801 has 16 divisors (see below), whose sum is σ = 28136655360. Its totient is φ = 13994922240.

The previous prime is 21047412703. The next prime is 21047412809. The reversal of 21047412801 is 10821474012.

It is not a de Polignac number, because 21047412801 - 2⁹ = 21047412289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21047412809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4758571 + ... + 4762991.

It is an arithmetic number, because the mean of its divisors is an integer number (1758540960).

Almost surely, 2^21047412801 is an apocalyptic number.

It is an amenable number.

21047412801 is a deficient number, since it is larger than the sum of its proper divisors (7089242559).

21047412801 is a wasteful number, since it uses less digits than its factorization.

21047412801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8216.

The product of its (nonzero) digits is 3584, while the sum is 30.

Adding to 21047412801 its reverse (10821474012), we get a palindrome (31868886813).

The spelling of 21047412801 in words is "twenty-one billion, forty-seven million, four hundred twelve thousand, eight hundred one".