2021212201951 has 2 divisors, whose sum is σ = 2021212201952. Its totient is φ = 2021212201950.

The previous prime is 2021212201907. The next prime is 2021212202027. The reversal of 2021212201951 is 1591022121202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021212201951 - 2²⁵ = 2021178647519 is a prime.

It is a super-2 number, since 2×2021212201951² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021212201651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010606100975 + 1010606100976.

It is an arithmetic number, because the mean of its divisors is an integer number (1010606100976).

Almost surely, 2^{2021212201951} is an apocalyptic number.

2021212201951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021212201951 is an equidigital number, since it uses as much as digits as its factorization.

2021212201951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The spelling of 2021212201951 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred one thousand, nine hundred fifty-one".