20120121013 has 4 divisors (see below), whose sum is σ = 20588030848. Its totient is φ = 19652211180.

The previous prime is 20120120963. The next prime is 20120121029. The reversal of 20120121013 is 31012102102.

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: 31012102102 = 2 ⋅15506051051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120120984 and 20120121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120151013) 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, 233954853 + ... + 233954938.

It is an arithmetic number, because the mean of its divisors is an integer number (5147007712).

Almost surely, 2^20120121013 is an apocalyptic number.

It is an amenable number.

20120121013 is a deficient number, since it is larger than the sum of its proper divisors (467909835).

20120121013 is an equidigital number, since it uses as much as digits as its factorization.

20120121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467909834.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20120121013 its reverse (31012102102), we get a palindrome (51132223115).

The spelling of 20120121013 in words is "twenty billion, one hundred twenty million, one hundred twenty-one thousand, thirteen".