102921640 has 32 divisors (see below), whose sum is σ = 235375560. Its totient is φ = 40492800.

The previous prime is 102921593. The next prime is 102921641. The reversal of 102921640 is 46129201.

It can be written as a sum of positive squares in 4 ways, for example, as 24740676 + 78180964 = 4974^2 + 8842^2 .

It is not an unprimeable number, because it can be changed into a prime (102921641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18651 + ... + 23530.

Almost surely, 2^102921640 is an apocalyptic number.

102921640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102921640 is an abundant number, since it is smaller than the sum of its proper divisors (132453920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102921640 is a wasteful number, since it uses less digits than its factorization.

102921640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42253 (or 42249 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 102921640 is about 10145.0303104525. The cubic root of 102921640 is about 468.6359120272.

The spelling of 102921640 in words is "one hundred two million, nine hundred twenty-one thousand, six hundred forty".