20220311821 has 4 divisors (see below), whose sum is σ = 20416625632. Its totient is φ = 20023998012.

The previous prime is 20220311773. The next prime is 20220311843. The reversal of 20220311821 is 12811302202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12811302202 = 2 ⋅6405651101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220311821 is a prime.

It is a super-2 number, since 2×20220311821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20220311792 and 20220311801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220311861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98156751 + ... + 98156956.

It is an arithmetic number, because the mean of its divisors is an integer number (5104156408).

Almost surely, 2^20220311821 is an apocalyptic number.

It is an amenable number.

20220311821 is a deficient number, since it is larger than the sum of its proper divisors (196313811).

20220311821 is a wasteful number, since it uses less digits than its factorization.

20220311821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196313810.

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 20220311821 in words is "twenty billion, two hundred twenty million, three hundred eleven thousand, eight hundred twenty-one".