2021000211961 has 2 divisors, whose sum is σ = 2021000211962. Its totient is φ = 2021000211960.

The previous prime is 2021000211929. The next prime is 2021000212019. The reversal of 2021000211961 is 1691120001202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1997077712400 + 23922499561 = 1413180^2 + 154669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021000211961 - 2⁵ = 2021000211929 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021000211911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010500105980 + 1010500105981.

It is an arithmetic number, because the mean of its divisors is an integer number (1010500105981).

Almost surely, 2^{2021000211961} is an apocalyptic number.

It is an amenable number.

2021000211961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021000211961 is an equidigital number, since it uses as much as digits as its factorization.

2021000211961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 2021000211961 in words is "two trillion, twenty-one billion, two hundred eleven thousand, nine hundred sixty-one".