1013188021 has 8 divisors (see below), whose sum is σ = 1023712704. Its totient is φ = 1002708960.

The previous prime is 1013187997. The next prime is 1013188073. The reversal of 1013188021 is 1208813101.

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

It is a cyclic number.

It is not a de Polignac number, because 1013188021 - 2¹⁷ = 1013056949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013188721) 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, 34176 + ... + 56518.

It is an arithmetic number, because the mean of its divisors is an integer number (127964088).

Almost surely, 2^1013188021 is an apocalyptic number.

It is an amenable number.

1013188021 is a deficient number, since it is larger than the sum of its proper divisors (10524683).

1013188021 is a wasteful number, since it uses less digits than its factorization.

1013188021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22811.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 1013188021 is about 31830.6145243852. The cubic root of 1013188021 is about 1004.3768224767.

The spelling of 1013188021 in words is "one billion, thirteen million, one hundred eighty-eight thousand, twenty-one".