201521121299 has 2 divisors, whose sum is σ = 201521121300. Its totient is φ = 201521121298.

The previous prime is 201521121283. The next prime is 201521121337. The reversal of 201521121299 is 992121125102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201521121299 - 2⁴ = 201521121283 is a prime.

It is a super-2 number, since 2×201521121299² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (201521121209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100760560649 + 100760560650.

It is an arithmetic number, because the mean of its divisors is an integer number (100760560650).

Almost surely, 2^201521121299 is an apocalyptic number.

201521121299 is a deficient number, since it is larger than the sum of its proper divisors (1).

201521121299 is an equidigital number, since it uses as much as digits as its factorization.

201521121299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 201521121299 in words is "two hundred one billion, five hundred twenty-one million, one hundred twenty-one thousand, two hundred ninety-nine".