211220099957 has 2 divisors, whose sum is σ = 211220099958. Its totient is φ = 211220099956.

The previous prime is 211220099933. The next prime is 211220099983. The reversal of 211220099957 is 759990022112.

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., 202109588356 + 9110511601 = 449566^2 + 95449^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220099957 - 2¹⁸ = 211219837813 is a prime.

It is a super-2 number, since 2×211220099957² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220099357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610049978 + 105610049979.

It is an arithmetic number, because the mean of its divisors is an integer number (105610049979).

Almost surely, 2^211220099957 is an apocalyptic number.

It is an amenable number.

211220099957 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220099957 is an equidigital number, since it uses as much as digits as its factorization.

211220099957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 47.

The spelling of 211220099957 in words is "two hundred eleven billion, two hundred twenty million, ninety-nine thousand, nine hundred fifty-seven".