20336621251 has 2 divisors, whose sum is σ = 20336621252. Its totient is φ = 20336621250.

The previous prime is 20336621237. The next prime is 20336621257. The reversal of 20336621251 is 15212663302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20336621251 - 2¹⁵ = 20336588483 is a prime.

It is not a weakly prime, because it can be changed into another prime (20336621257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10168310625 + 10168310626.

It is an arithmetic number, because the mean of its divisors is an integer number (10168310626).

Almost surely, 2^20336621251 is an apocalyptic number.

20336621251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20336621251 is an equidigital number, since it uses as much as digits as its factorization.

20336621251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 20336621251 in words is "twenty billion, three hundred thirty-six million, six hundred twenty-one thousand, two hundred fifty-one".