21002133101 has 2 divisors, whose sum is σ = 21002133102. Its totient is φ = 21002133100.

The previous prime is 21002133059. The next prime is 21002133121. The reversal of 21002133101 is 10133120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19992546025 + 1009587076 = 141395^2 + 31774^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002133101 - 2¹⁰ = 21002132077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002133121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501066550 + 10501066551.

It is an arithmetic number, because the mean of its divisors is an integer number (10501066551).

Almost surely, 2^21002133101 is an apocalyptic number.

It is an amenable number.

21002133101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002133101 is an equidigital number, since it uses as much as digits as its factorization.

21002133101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21002133101 its reverse (10133120012), we get a palindrome (31135253113).

The spelling of 21002133101 in words is "twenty-one billion, two million, one hundred thirty-three thousand, one hundred one".