1121407921 has 16 divisors (see below), whose sum is σ = 1164222720. Its totient is φ = 1079520640.

The previous prime is 1121407909. The next prime is 1121407939. The reversal of 1121407921 is 1297041211.

It is a cyclic number.

It is not a de Polignac number, because 1121407921 - 2¹⁵ = 1121375153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121407921.

It is not an unprimeable number, because it can be changed into a prime (1121407961) 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, 948951 + ... + 950131.

It is an arithmetic number, because the mean of its divisors is an integer number (72763920).

Almost surely, 2^1121407921 is an apocalyptic number.

It is an amenable number.

1121407921 is a deficient number, since it is larger than the sum of its proper divisors (42814799).

1121407921 is a wasteful number, since it uses less digits than its factorization.

1121407921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1121407921 is about 33487.4292981710. The cubic root of 1121407921 is about 1038.9337941976.

The spelling of 1121407921 in words is "one billion, one hundred twenty-one million, four hundred seven thousand, nine hundred twenty-one".