100121640 has 64 divisors (see below), whose sum is σ = 316180800. Its totient is φ = 25293312.

The previous prime is 100121639. The next prime is 100121669. The reversal of 100121640 is 46121001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19677 + ... + 24236.

It is an arithmetic number, because the mean of its divisors is an integer number (4940325).

Almost surely, 2^100121640 is an apocalyptic number.

100121640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121640 is an abundant number, since it is smaller than the sum of its proper divisors (216059160).

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

100121640 is a wasteful number, since it uses less digits than its factorization.

100121640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43946 (or 43942 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 100121640 is about 10006.0801515878. The cubic root of 100121640 is about 464.3470080588.

Adding to 100121640 its reverse (46121001), we get a palindrome (146242641).

The spelling of 100121640 in words is "one hundred million, one hundred twenty-one thousand, six hundred forty".