21620764305450 has 96 divisors (see below), whose sum is σ = 60012087909120. Its totient is φ = 5723452886400.

The previous prime is 21620764305407. The next prime is 21620764305487. The reversal of 21620764305450 is 5450346702612.

21620764305450 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 0 + 76 + 4 + 30 + 545 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21620764305396 and 21620764305405.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58265346 + ... + 58635245.

It is an arithmetic number, because the mean of its divisors is an integer number (625125915720).

Almost surely, 2^{21620764305450} is an apocalyptic number.

21620764305450 is an abundant number, since it is smaller than the sum of its proper divisors (38391323603670).

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

21620764305450 is a wasteful number, since it uses less digits than its factorization.

21620764305450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116900749 (or 116900738 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 21620764305450 in words is "twenty-one trillion, six hundred twenty billion, seven hundred sixty-four million, three hundred five thousand, four hundred fifty".