100721994 has 32 divisors (see below), whose sum is σ = 208885824. Its totient is φ = 32353920.

The previous prime is 100721993. The next prime is 100722001. The reversal of 100721994 is 499127001.

It is not an unprimeable number, because it can be changed into a prime (100721993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17952 + ... + 22884.

It is an arithmetic number, because the mean of its divisors is an integer number (6527682).

Almost surely, 2^100721994 is an apocalyptic number.

100721994 is an abundant number, since it is smaller than the sum of its proper divisors (108163830).

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

100721994 is a wasteful number, since it uses less digits than its factorization.

100721994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5062.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 100721994 is about 10036.0347747504. The cubic root of 100721994 is about 465.2732721382.

Adding to 100721994 its reverse (499127001), we get a palindrome (599848995).

The spelling of 100721994 in words is "one hundred million, seven hundred twenty-one thousand, nine hundred ninety-four".