102621131 has 2 divisors, whose sum is σ = 102621132. Its totient is φ = 102621130.

The previous prime is 102621121. The next prime is 102621133. The reversal of 102621131 is 131126201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102621131 - 2¹⁰ = 102620107 is a prime.

It is a super-2 number, since 2×102621131² = 21062193055438322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 102621133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102621133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51310565 + 51310566.

It is an arithmetic number, because the mean of its divisors is an integer number (51310566).

Almost surely, 2^102621131 is an apocalyptic number.

102621131 is a deficient number, since it is larger than the sum of its proper divisors (1).

102621131 is an equidigital number, since it uses as much as digits as its factorization.

102621131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 102621131 is about 10130.2088329906. The cubic root of 102621131 is about 468.1793621193.

Adding to 102621131 its reverse (131126201), we get a palindrome (233747332).

The spelling of 102621131 in words is "one hundred two million, six hundred twenty-one thousand, one hundred thirty-one".