20961305051 has 2 divisors, whose sum is σ = 20961305052. Its totient is φ = 20961305050.

The previous prime is 20961305041. The next prime is 20961305087. The reversal of 20961305051 is 15050316902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20961305051 - 2²² = 20957110747 is a prime.

It is a super-2 number, since 2×20961305051² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20961304999 and 20961305017.

It is not a weakly prime, because it can be changed into another prime (20961305041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10480652525 + 10480652526.

It is an arithmetic number, because the mean of its divisors is an integer number (10480652526).

Almost surely, 2^20961305051 is an apocalyptic number.

20961305051 is a deficient number, since it is larger than the sum of its proper divisors (1).

20961305051 is an equidigital number, since it uses as much as digits as its factorization.

20961305051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 32.

The spelling of 20961305051 in words is "twenty billion, nine hundred sixty-one million, three hundred five thousand, fifty-one".