2199029921 has 6 divisors (see below), whose sum is σ = 2417115666. Its totient is φ = 1999118000.

The previous prime is 2199029909. The next prime is 2199029927. The reversal of 2199029921 is 1299209912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1678049296 + 520980625 = 40964^2 + 22825^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2199029921 is a prime.

It is a super-4 number, since 4×2199029921⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2199029927) 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, 9086780 + ... + 9087021.

It is an arithmetic number, because the mean of its divisors is an integer number (402852611).

Almost surely, 2^2199029921 is an apocalyptic number.

It is an amenable number.

2199029921 is a deficient number, since it is larger than the sum of its proper divisors (218085745).

2199029921 is a wasteful number, since it uses less digits than its factorization.

2199029921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18173823 (or 18173812 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 2199029921 is about 46893.8153811353. The cubic root of 2199029921 is about 1300.4002556485.

Subtracting from 2199029921 its reverse (1299209912), we obtain a square (899820009 = 29997²).

The spelling of 2199029921 in words is "two billion, one hundred ninety-nine million, twenty-nine thousand, nine hundred twenty-one".