102140021 has 4 divisors (see below), whose sum is σ = 102598272. Its totient is φ = 101681772.

The previous prime is 102140011. The next prime is 102140041. The reversal of 102140021 is 120041201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102140021 - 2²² = 97945717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102139984 and 102140011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102140011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228791 + ... + 229236.

It is an arithmetic number, because the mean of its divisors is an integer number (25649568).

Almost surely, 2^102140021 is an apocalyptic number.

It is an amenable number.

102140021 is a deficient number, since it is larger than the sum of its proper divisors (458251).

102140021 is an equidigital number, since it uses as much as digits as its factorization.

102140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458250.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 102140021 is about 10106.4346334402. The cubic root of 102140021 is about 467.4465738178.

Adding to 102140021 its reverse (120041201), we get a palindrome (222181222).

The spelling of 102140021 in words is "one hundred two million, one hundred forty thousand, twenty-one".