103213020021 has 4 divisors (see below), whose sum is σ = 137617360032. Its totient is φ = 68808680012.

The previous prime is 103213020017. The next prime is 103213020037. The reversal of 103213020021 is 120020312301.

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 103213020021 - 2² = 103213020017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103213020121) 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, 17202170001 + ... + 17202170006.

It is an arithmetic number, because the mean of its divisors is an integer number (34404340008).

Almost surely, 2^103213020021 is an apocalyptic number.

It is an amenable number.

103213020021 is a deficient number, since it is larger than the sum of its proper divisors (34404340011).

103213020021 is an equidigital number, since it uses as much as digits as its factorization.

103213020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34404340010.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 103213020021 its reverse (120020312301), we get a palindrome (223233332322).

The spelling of 103213020021 in words is "one hundred three billion, two hundred thirteen million, twenty thousand, twenty-one".