20021220311 has 8 divisors (see below), whose sum is σ = 20115863040. Its totient is φ = 19926621432.

The previous prime is 20021220217. The next prime is 20021220377. The reversal of 20021220311 is 11302212002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20021220311 - 2²⁶ = 19954111447 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 (20021220391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232480 + ... + 1248618.

It is an arithmetic number, because the mean of its divisors is an integer number (2514482880).

Almost surely, 2^20021220311 is an apocalyptic number.

20021220311 is a deficient number, since it is larger than the sum of its proper divisors (94642729).

20021220311 is a wasteful number, since it uses less digits than its factorization.

20021220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21925.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20021220311 its reverse (11302212002), we get a palindrome (31323432313).

The spelling of 20021220311 in words is "twenty billion, twenty-one million, two hundred twenty thousand, three hundred eleven".