20021121030311 has 48 divisors (see below), whose sum is σ = 22913947146240. Its totient is φ = 17438717852160.

The previous prime is 20021121030307. The next prime is 20021121030341. The reversal of 20021121030311 is 11303012112002.

It is not a de Polignac number, because 20021121030311 - 2² = 20021121030307 is a prime.

It is a super-2 number, since 2×20021121030311² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021121030311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021121030341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1233655145 + ... + 1233671373.

It is an arithmetic number, because the mean of its divisors is an integer number (477373898880).

Almost surely, 2^{20021121030311} is an apocalyptic number.

20021121030311 is a deficient number, since it is larger than the sum of its proper divisors (2892826115929).

20021121030311 is a wasteful number, since it uses less digits than its factorization.

20021121030311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22304 (or 22287 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20021121030311 its reverse (11303012112002), we get a palindrome (31324133142313).

The spelling of 20021121030311 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, thirty thousand, three hundred eleven".