20221021487951 has 2 divisors, whose sum is σ = 20221021487952. Its totient is φ = 20221021487950.

The previous prime is 20221021487929. The next prime is 20221021487983. The reversal of 20221021487951 is 15978412012202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20221021487951 - 2¹⁰ = 20221021486927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221021480951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110510743975 + 10110510743976.

It is an arithmetic number, because the mean of its divisors is an integer number (10110510743976).

Almost surely, 2^{20221021487951} is an apocalyptic number.

20221021487951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221021487951 is an equidigital number, since it uses as much as digits as its factorization.

20221021487951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 20221021487951 in words is "twenty trillion, two hundred twenty-one billion, twenty-one million, four hundred eighty-seven thousand, nine hundred fifty-one".