20220211021 has 4 divisors (see below), whose sum is σ = 20349002332. Its totient is φ = 20091419712.

The previous prime is 20220210991. The next prime is 20220211049. The reversal of 20220211021 is 12011202202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4487526121 + 15732684900 = 66989^2 + 125430^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220211021 - 2¹³ = 20220202829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20220210992 and 20220211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220211061) 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, 64395420 + ... + 64395733.

It is an arithmetic number, because the mean of its divisors is an integer number (5087250583).

Almost surely, 2^20220211021 is an apocalyptic number.

It is an amenable number.

20220211021 is a deficient number, since it is larger than the sum of its proper divisors (128791311).

20220211021 is a wasteful number, since it uses less digits than its factorization.

20220211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128791310.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20220211021 its reverse (12011202202), we get a palindrome (32231413223).

The spelling of 20220211021 in words is "twenty billion, two hundred twenty million, two hundred eleven thousand, twenty-one".