1111157421 has 16 divisors (see below), whose sum is σ = 1624442688. Its totient is φ = 670006400.

The previous prime is 1111157389. The next prime is 1111157423. The reversal of 1111157421 is 1247511111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1111157421 - 2⁵ = 1111157389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111157391 and 1111157400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111157423) 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, 78960 + ... + 91961.

It is an arithmetic number, because the mean of its divisors is an integer number (101527668).

Almost surely, 2^1111157421 is an apocalyptic number.

1111157421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111157421 is a deficient number, since it is larger than the sum of its proper divisors (513285267).

1111157421 is a wasteful number, since it uses less digits than its factorization.

1111157421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171132.

The product of its digits is 280, while the sum is 24.

The square root of 1111157421 is about 33334.0279744288. The cubic root of 1111157421 is about 1035.7585580106.

Adding to 1111157421 its reverse (1247511111), we get a palindrome (2358668532).

The spelling of 1111157421 in words is "one billion, one hundred eleven million, one hundred fifty-seven thousand, four hundred twenty-one".