20413121311 has 4 divisors (see below), whose sum is σ = 22268859624. Its totient is φ = 18557383000.

The previous prime is 20413121303. The next prime is 20413121329. The reversal of 20413121311 is 11312131402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20413121311 - 2³ = 20413121303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413121611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927869140 + ... + 927869161.

It is an arithmetic number, because the mean of its divisors is an integer number (5567214906).

Almost surely, 2^20413121311 is an apocalyptic number.

20413121311 is a deficient number, since it is larger than the sum of its proper divisors (1855738313).

20413121311 is a wasteful number, since it uses less digits than its factorization.

20413121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855738312.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20413121311 its reverse (11312131402), we get a palindrome (31725252713).

The spelling of 20413121311 in words is "twenty billion, four hundred thirteen million, one hundred twenty-one thousand, three hundred eleven".