2193693921 has 12 divisors (see below), whose sum is σ = 3286027472. Its totient is φ = 1462462452.

The previous prime is 2193693913. The next prime is 2193693947. The reversal of 2193693921 is 1293963912.

It is not a de Polignac number, because 2193693921 - 2³ = 2193693913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2193693721) 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, 4513531 + ... + 4514016.

Almost surely, 2^2193693921 is an apocalyptic number.

It is an amenable number.

2193693921 is a deficient number, since it is larger than the sum of its proper divisors (1092333551).

2193693921 is an frugal number, since it uses more digits than its factorization.

2193693921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027562 (or 9027550 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 2193693921 is about 46836.8863290463. The cubic root of 2193693921 is about 1299.3475860486.

The spelling of 2193693921 in words is "two billion, one hundred ninety-three million, six hundred ninety-three thousand, nine hundred twenty-one".