921099994 has 4 divisors (see below), whose sum is σ = 1381649994. Its totient is φ = 460549996.

The previous prime is 921099989. The next prime is 921100007. The reversal of 921099994 is 499990129.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 790340769 + 130759225 = 28113^2 + 11435^2 .

It is a super-3 number, since 3×921099994³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230274997 + ... + 230275000.

Almost surely, 2^921099994 is an apocalyptic number.

921099994 is a deficient number, since it is larger than the sum of its proper divisors (460550000).

921099994 is a wasteful number, since it uses less digits than its factorization.

921099994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460549999.

The product of its (nonzero) digits is 472392, while the sum is 52.

The square root of 921099994 is about 30349.6292234353. The cubic root of 921099994 is about 972.9762957016.

The spelling of 921099994 in words is "nine hundred twenty-one million, ninety-nine thousand, nine hundred ninety-four".