102908221961 has 4 divisors (see below), whose sum is σ = 103014204624. Its totient is φ = 102802239300.

The previous prime is 102908221943. The next prime is 102908222017. The reversal of 102908221961 is 169122809201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169122809201 = 127 ⋅1331675663.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102908221961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102908221931) 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, 52989875 + ... + 52991816.

It is an arithmetic number, because the mean of its divisors is an integer number (25753551156).

Almost surely, 2^102908221961 is an apocalyptic number.

It is an amenable number.

102908221961 is a deficient number, since it is larger than the sum of its proper divisors (105982663).

102908221961 is an equidigital number, since it uses as much as digits as its factorization.

102908221961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105982662.

The product of its (nonzero) digits is 31104, while the sum is 41.

The spelling of 102908221961 in words is "one hundred two billion, nine hundred eight million, two hundred twenty-one thousand, nine hundred sixty-one".