102421947 has 6 divisors (see below), whose sum is σ = 136585972. Its totient is φ = 68269612.

The previous prime is 102421909. The next prime is 102421981. The reversal of 102421947 is 749124201.

It is not a de Polignac number, because 102421947 - 2¹⁶ = 102356411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102421987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14608 + ... + 20450.

Almost surely, 2^102421947 is an apocalyptic number.

102421947 is a deficient number, since it is larger than the sum of its proper divisors (34164025).

102421947 is an frugal number, since it uses more digits than its factorization.

102421947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689 (or 5846 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 102421947 is about 10120.3728686250. The cubic root of 102421947 is about 467.8762593813.

The spelling of 102421947 in words is "one hundred two million, four hundred twenty-one thousand, nine hundred forty-seven".