1021151231 has 4 divisors (see below), whose sum is σ = 1021287432. Its totient is φ = 1021015032.

The previous prime is 1021151203. The next prime is 1021151233. The reversal of 1021151231 is 1321511201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1321511201 = 17 ⋅77735953.

It is a cyclic number.

It is not a de Polignac number, because 1021151231 - 2¹⁴ = 1021134847 is a prime.

It is a super-2 number, since 2×1021151231² = 2085499673145630722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021151233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56156 + ... + 72081.

It is an arithmetic number, because the mean of its divisors is an integer number (255321858).

Almost surely, 2^1021151231 is an apocalyptic number.

1021151231 is a deficient number, since it is larger than the sum of its proper divisors (136201).

1021151231 is an equidigital number, since it uses as much as digits as its factorization.

1021151231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136200.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1021151231 is about 31955.4569831195. The cubic root of 1021151231 is about 1007.0012780431.

Adding to 1021151231 its reverse (1321511201), we get a palindrome (2342662432).

The spelling of 1021151231 in words is "one billion, twenty-one million, one hundred fifty-one thousand, two hundred thirty-one".