102121031 has 2 divisors, whose sum is σ = 102121032. Its totient is φ = 102121030.

The previous prime is 102121027. The next prime is 102121043. The reversal of 102121031 is 130121201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102121031 - 2² = 102121027 is a prime.

It is a super-2 number, since 2×102121031² = 20857409945005922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102121021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060515 + 51060516.

It is an arithmetic number, because the mean of its divisors is an integer number (51060516).

Almost surely, 2^102121031 is an apocalyptic number.

102121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121031 is an equidigital number, since it uses as much as digits as its factorization.

102121031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 102121031 is about 10105.4950893066. The cubic root of 102121031 is about 467.4176026058.

Adding to 102121031 its reverse (130121201), we get a palindrome (232242232).

The spelling of 102121031 in words is "one hundred two million, one hundred twenty-one thousand, thirty-one".