1122156021 has 8 divisors (see below), whose sum is σ = 1709952064. Its totient is φ = 641232000.

The previous prime is 1122155989. The next prime is 1122156031. The reversal of 1122156021 is 1206512211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1122156021 - 2⁵ = 1122155989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 53436001 = 1122156021 / (1 + 1 + 2 + 2 + 1 + 5 + 6 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122156031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26717980 + ... + 26718021.

It is an arithmetic number, because the mean of its divisors is an integer number (213744008).

Almost surely, 2^1122156021 is an apocalyptic number.

It is an amenable number.

1122156021 is a deficient number, since it is larger than the sum of its proper divisors (587796043).

1122156021 is an equidigital number, since it uses as much as digits as its factorization.

1122156021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53436011.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1122156021 is about 33498.5972989915. The cubic root of 1122156021 is about 1039.1647697982.

Adding to 1122156021 its reverse (1206512211), we get a palindrome (2328668232).

The spelling of 1122156021 in words is "one billion, one hundred twenty-two million, one hundred fifty-six thousand, twenty-one".