1013212021 has 4 divisors (see below), whose sum is σ = 1013276044. Its totient is φ = 1013148000.

The previous prime is 1013212009. The next prime is 1013212027. The reversal of 1013212021 is 1202123101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1202123101 = 769 ⋅1563229.

It can be written as a sum of positive squares in 2 ways, for example, as 75933796 + 937278225 = 8714^2 + 30615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013212021 - 2²¹ = 1011114869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1013211992 and 1013212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013212027) 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, 10921 + ... + 46321.

It is an arithmetic number, because the mean of its divisors is an integer number (253319011).

Almost surely, 2^1013212021 is an apocalyptic number.

It is an amenable number.

1013212021 is a deficient number, since it is larger than the sum of its proper divisors (64023).

1013212021 is an equidigital number, since it uses as much as digits as its factorization.

1013212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64022.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1013212021 is about 31830.9915177017. The cubic root of 1013212021 is about 1004.3847528420.

Adding to 1013212021 its reverse (1202123101), we get a palindrome (2215335122).

The spelling of 1013212021 in words is "one billion, thirteen million, two hundred twelve thousand, twenty-one".