20130213121 has 2 divisors, whose sum is σ = 20130213122. Its totient is φ = 20130213120.

The previous prime is 20130213083. The next prime is 20130213133. The reversal of 20130213121 is 12131203102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15954468721 + 4175744400 = 126311^2 + 64620^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130213121 - 2¹⁵ = 20130180353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20130213095 and 20130213104.

It is not a weakly prime, because it can be changed into another prime (20130213221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065106560 + 10065106561.

It is an arithmetic number, because the mean of its divisors is an integer number (10065106561).

Almost surely, 2^20130213121 is an apocalyptic number.

It is an amenable number.

20130213121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130213121 is an equidigital number, since it uses as much as digits as its factorization.

20130213121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20130213121 its reverse (12131203102), we get a palindrome (32261416223).

The spelling of 20130213121 in words is "twenty billion, one hundred thirty million, two hundred thirteen thousand, one hundred twenty-one".