102146021 has 2 divisors, whose sum is σ = 102146022. Its totient is φ = 102146020.

The previous prime is 102146003. The next prime is 102146039. The reversal of 102146021 is 120641201.

It is a balanced prime because it is at equal distance from previous prime (102146003) and next prime (102146039).

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 42393121 = 7730^2 + 6511^2 .

It is a cyclic number.

It is not a de Polignac number, because 102146021 - 2²² = 97951717 is a prime.

It is a super-2 number, since 2×102146021² = 20867619212264882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102146041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51073010 + 51073011.

It is an arithmetic number, because the mean of its divisors is an integer number (51073011).

Almost surely, 2^102146021 is an apocalyptic number.

It is an amenable number.

102146021 is a deficient number, since it is larger than the sum of its proper divisors (1).

102146021 is an equidigital number, since it uses as much as digits as its factorization.

102146021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 102146021 is about 10106.7314696691. The cubic root of 102146021 is about 467.4557266928.

Adding to 102146021 its reverse (120641201), we get a palindrome (222787222).

The spelling of 102146021 in words is "one hundred two million, one hundred forty-six thousand, twenty-one".