21621411753511 has 8 divisors (see below), whose sum is σ = 21708284748480. Its totient is φ = 21534560022528.

The previous prime is 21621411753479. The next prime is 21621411753577. The reversal of 21621411753511 is 11535711412612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21621411753511 - 2⁵ = 21621411753479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621411753611) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3276726 + ... + 7347091.

It is an arithmetic number, because the mean of its divisors is an integer number (2713535593560).

Almost surely, 2^{21621411753511} is an apocalyptic number.

21621411753511 is a deficient number, since it is larger than the sum of its proper divisors (86872994969).

21621411753511 is a wasteful number, since it uses less digits than its factorization.

21621411753511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10631993.

The product of its digits is 50400, while the sum is 40.

The spelling of 21621411753511 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, seven hundred fifty-three thousand, five hundred eleven".