1021001213 has 4 divisors (see below), whose sum is σ = 1053936768. Its totient is φ = 988065660.

The previous prime is 1021001207. The next prime is 1021001237. The reversal of 1021001213 is 3121001201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3121001201 = 1097 ⋅2845033.

It is a cyclic number.

It is not a de Polignac number, because 1021001213 - 2²² = 1016806909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021001194 and 1021001203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021001203) 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, 16467731 + ... + 16467792.

It is an arithmetic number, because the mean of its divisors is an integer number (263484192).

Almost surely, 2^1021001213 is an apocalyptic number.

It is an amenable number.

1021001213 is a deficient number, since it is larger than the sum of its proper divisors (32935555).

1021001213 is an equidigital number, since it uses as much as digits as its factorization.

1021001213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32935554.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1021001213 is about 31953.1095982848. The cubic root of 1021001213 is about 1006.9519625544.

Subtracting from 1021001213 its product of nonzero digits (12), we obtain a palindrome (1021001201).

Adding to 1021001213 its reverse (3121001201), we get a palindrome (4142002414).

The spelling of 1021001213 in words is "one billion, twenty-one million, one thousand, two hundred thirteen".