20110311021 has 16 divisors (see below), whose sum is σ = 27326163200. Its totient is φ = 13152829248.

The previous prime is 20110311017. The next prime is 20110311047. The reversal of 20110311021 is 12011301102.

It is not a de Polignac number, because 20110311021 - 2² = 20110311017 is a prime.

It is a super-2 number, since 2×20110311021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20110310988 and 20110311006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110301021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233026 + ... + 307443.

It is an arithmetic number, because the mean of its divisors is an integer number (1707885200).

Almost surely, 2^20110311021 is an apocalyptic number.

It is an amenable number.

20110311021 is a deficient number, since it is larger than the sum of its proper divisors (7215852179).

20110311021 is a wasteful number, since it uses less digits than its factorization.

20110311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540708.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 20110311021 its reverse (12011301102), we get a palindrome (32121612123).

The spelling of 20110311021 in words is "twenty billion, one hundred ten million, three hundred eleven thousand, twenty-one".