20102121311 has 4 divisors (see below), whose sum is σ = 20104798800. Its totient is φ = 20099443824.

The previous prime is 20102121301. The next prime is 20102121329. The reversal of 20102121311 is 11312120102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11312120102 = 2 ⋅5656060051.

It is a cyclic number.

It is not a de Polignac number, because 20102121311 - 2²² = 20097927007 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 (20102121301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1327451 + ... + 1342508.

It is an arithmetic number, because the mean of its divisors is an integer number (5026199700).

Almost surely, 2^20102121311 is an apocalyptic number.

20102121311 is a deficient number, since it is larger than the sum of its proper divisors (2677489).

20102121311 is an equidigital number, since it uses as much as digits as its factorization.

20102121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677488.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20102121311 its reverse (11312120102), we get a palindrome (31414241413).

The spelling of 20102121311 in words is "twenty billion, one hundred two million, one hundred twenty-one thousand, three hundred eleven".