4194294921 has 12 divisors (see below), whose sum is σ = 6061585348. Its totient is φ = 2794738464.

The previous prime is 4194294919. The next prime is 4194294931. The reversal of 4194294921 is 1294924914.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2581148025 + 1613146896 = 50805^2 + 40164^2 .

It is not a de Polignac number, because 4194294921 - 2¹ = 4194294919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4194294931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103150 + ... + 137943.

Almost surely, 2^4194294921 is an apocalyptic number.

It is an amenable number.

4194294921 is a deficient number, since it is larger than the sum of its proper divisors (1867290427).

4194294921 is a wasteful number, since it uses less digits than its factorization.

4194294921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243032 (or 243029 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 4194294921 is about 64763.3763866585. The cubic root of 4194294921 is about 1612.6977802473.

The spelling of 4194294921 in words is "four billion, one hundred ninety-four million, two hundred ninety-four thousand, nine hundred twenty-one".