1020421213 has 4 divisors (see below), whose sum is σ = 1166195680. Its totient is φ = 874646748.

The previous prime is 1020421177. The next prime is 1020421219. The reversal of 1020421213 is 3121240201.

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: 3121240201 = 181 ⋅17244421.

It is a cyclic number.

It is not a de Polignac number, because 1020421213 - 2²¹ = 1018324061 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 (1020421219) 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, 72887223 + ... + 72887236.

It is an arithmetic number, because the mean of its divisors is an integer number (291548920).

Almost surely, 2^1020421213 is an apocalyptic number.

It is an amenable number.

1020421213 is a deficient number, since it is larger than the sum of its proper divisors (145774467).

1020421213 is an equidigital number, since it uses as much as digits as its factorization.

1020421213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145774466.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1020421213 is about 31944.0325100010. The cubic root of 1020421213 is about 1006.7612534229.

Adding to 1020421213 its reverse (3121240201), we get a palindrome (4141661414).

The spelling of 1020421213 in words is "one billion, twenty million, four hundred twenty-one thousand, two hundred thirteen".