21621364234603 has 16 divisors (see below), whose sum is σ = 24937863413760. Its totient is φ = 18361812377376.

The previous prime is 21621364234601. The next prime is 21621364234681. The reversal of 21621364234603 is 30643246312612.

It is a cyclic number.

It is not a de Polignac number, because 21621364234603 - 2¹ = 21621364234601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21621364234603.

It is not an unprimeable number, because it can be changed into a prime (21621364234601) 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, 18211926 + ... + 19362772.

It is an arithmetic number, because the mean of its divisors is an integer number (1558616463360).

Almost surely, 2^{21621364234603} is an apocalyptic number.

21621364234603 is a deficient number, since it is larger than the sum of its proper divisors (3316499179157).

21621364234603 is a wasteful number, since it uses less digits than its factorization.

21621364234603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175586.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 21621364234603 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred sixty-four million, two hundred thirty-four thousand, six hundred three".