20550432141621 has 12 divisors (see below), whose sum is σ = 29686820432620. Its totient is φ = 13698966758400.

The previous prime is 20550432141511. The next prime is 20550432141637. The reversal of 20550432141621 is 12614123405502.

20550432141621 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 0 + 4 + 3 + 21 + 4 + 1 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6703884142596 + 13846547999025 = 2589186^2 + 3721095^2 .

It is not a de Polignac number, because 20550432141621 - 2⁷ = 20550432141493 is a prime.

It is a super-2 number, since 2×20550432141621² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550432141641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110012830 + ... + 110199471.

Almost surely, 2^{20550432141621} is an apocalyptic number.

It is an amenable number.

20550432141621 is a deficient number, since it is larger than the sum of its proper divisors (9136388290999).

20550432141621 is a wasteful number, since it uses less digits than its factorization.

20550432141621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220222676 (or 220222673 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 20550432141621 in words is "twenty trillion, five hundred fifty billion, four hundred thirty-two million, one hundred forty-one thousand, six hundred twenty-one".