20102202220021 has 4 divisors (see below), whose sum is σ = 21160212863200. Its totient is φ = 19044191576844.

The previous prime is 20102202220019. The next prime is 20102202220033. The reversal of 20102202220021 is 12002220220102.

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 20102202220021 - 2¹ = 20102202220019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102202219977 and 20102202220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102202221021) 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, 529005321561 + ... + 529005321598.

It is an arithmetic number, because the mean of its divisors is an integer number (5290053215800).

Almost surely, 2^{20102202220021} is an apocalyptic number.

It is an amenable number.

20102202220021 is a deficient number, since it is larger than the sum of its proper divisors (1058010643179).

20102202220021 is a wasteful number, since it uses less digits than its factorization.

20102202220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058010643178.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20102202220021 its reverse (12002220220102), we get a palindrome (32104422440123).

The spelling of 20102202220021 in words is "twenty trillion, one hundred two billion, two hundred two million, two hundred twenty thousand, twenty-one".