402211877981 has 2 divisors, whose sum is σ = 402211877982. Its totient is φ = 402211877980.

The previous prime is 402211877869. The next prime is 402211878007. The reversal of 402211877981 is 189778112204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389543249956 + 12668628025 = 624134^2 + 112555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402211877981 is a prime.

It is a super-2 number, since 2×402211877981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402211877381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201105938990 + 201105938991.

It is an arithmetic number, because the mean of its divisors is an integer number (201105938991).

Almost surely, 2^402211877981 is an apocalyptic number.

It is an amenable number.

402211877981 is a deficient number, since it is larger than the sum of its proper divisors (1).

402211877981 is an equidigital number, since it uses as much as digits as its factorization.

402211877981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 50.

The spelling of 402211877981 in words is "four hundred two billion, two hundred eleven million, eight hundred seventy-seven thousand, nine hundred eighty-one".