102031621 has 4 divisors (see below), whose sum is σ = 102078412. Its totient is φ = 101984832.

The previous prime is 102031613. The next prime is 102031649. The reversal of 102031621 is 126130201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48580900 + 53450721 = 6970^2 + 7311^2 .

It is a cyclic number.

It is not a de Polignac number, because 102031621 - 2³ = 102031613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102031595 and 102031604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102031921) 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, 19956 + ... + 24541.

It is an arithmetic number, because the mean of its divisors is an integer number (25519603).

Almost surely, 2^102031621 is an apocalyptic number.

It is an amenable number.

102031621 is a deficient number, since it is larger than the sum of its proper divisors (46791).

102031621 is an equidigital number, since it uses as much as digits as its factorization.

102031621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46790.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 102031621 is about 10101.0702898257. The cubic root of 102031621 is about 467.2811501042.

Adding to 102031621 its reverse (126130201), we get a palindrome (228161822).

The spelling of 102031621 in words is "one hundred two million, thirty-one thousand, six hundred twenty-one".