201521121383 has 2 divisors, whose sum is σ = 201521121384. Its totient is φ = 201521121382.

The previous prime is 201521121337. The next prime is 201521121479. The reversal of 201521121383 is 383121125102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201521121383 - 2⁸ = 201521121127 is a prime.

It is a super-2 number, since 2×201521121383² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201521121283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100760560691 + 100760560692.

It is an arithmetic number, because the mean of its divisors is an integer number (100760560692).

Almost surely, 2^201521121383 is an apocalyptic number.

201521121383 is a deficient number, since it is larger than the sum of its proper divisors (1).

201521121383 is an equidigital number, since it uses as much as digits as its factorization.

201521121383 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 201521121383 its reverse (383121125102), we get a palindrome (584642246485).

The spelling of 201521121383 in words is "two hundred one billion, five hundred twenty-one million, one hundred twenty-one thousand, three hundred eighty-three".