1021623013 has 4 divisors (see below), whose sum is σ = 1033931808. Its totient is φ = 1009314220.

The previous prime is 1021622983. The next prime is 1021623017. The reversal of 1021623013 is 3103261201.

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.

It is a cyclic number.

It is not a de Polignac number, because 1021623013 - 2⁵ = 1021622981 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 (1021623017) 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, 6154273 + ... + 6154438.

It is an arithmetic number, because the mean of its divisors is an integer number (258482952).

Almost surely, 2^1021623013 is an apocalyptic number.

It is an amenable number.

1021623013 is a deficient number, since it is larger than the sum of its proper divisors (12308795).

1021623013 is an equidigital number, since it uses as much as digits as its factorization.

1021623013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12308794.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1021623013 is about 31962.8379997772. The cubic root of 1021623013 is about 1007.1563356933.

Adding to 1021623013 its reverse (3103261201), we get a palindrome (4124884214).

The spelling of 1021623013 in words is "one billion, twenty-one million, six hundred twenty-three thousand, thirteen".