20012222021 has 4 divisors (see below), whose sum is σ = 21831514944. Its totient is φ = 18192929100.

The previous prime is 20012222011. The next prime is 20012222029. The reversal of 20012222021 is 12022221002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20012222021 - 2¹⁴ = 20012205637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012221987 and 20012222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012222029) 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, 909646445 + ... + 909646466.

It is an arithmetic number, because the mean of its divisors is an integer number (5457878736).

Almost surely, 2^20012222021 is an apocalyptic number.

It is an amenable number.

20012222021 is a deficient number, since it is larger than the sum of its proper divisors (1819292923).

20012222021 is a wasteful number, since it uses less digits than its factorization.

20012222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819292922.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20012222021 its reverse (12022221002), we get a palindrome (32034443023).

It can be divided in two parts, 200 and 12222021, that added together give a palindrome (12222221).

The spelling of 20012222021 in words is "twenty billion, twelve million, two hundred twenty-two thousand, twenty-one".