201021210209977 has 2 divisors, whose sum is σ = 201021210209978. Its totient is φ = 201021210209976.

The previous prime is 201021210209971. The next prime is 201021210210001. The reversal of 201021210209977 is 779902012120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193246169492601 + 7775040717376 = 13901301^2 + 2788376^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021210209977 - 2⁷ = 201021210209849 is a prime.

It is a super-2 number, since 2×201021210209977² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201021210209971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510605104988 + 100510605104989.

It is an arithmetic number, because the mean of its divisors is an integer number (100510605104989).

Almost surely, 2^{201021210209977} is an apocalyptic number.

It is an amenable number.

201021210209977 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021210209977 is an equidigital number, since it uses as much as digits as its factorization.

201021210209977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The spelling of 201021210209977 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, two hundred nine thousand, nine hundred seventy-seven".