20102211220021 has 4 divisors (see below), whose sum is σ = 22973955680032. Its totient is φ = 17230466760012.

The previous prime is 20102211220009. The next prime is 20102211220057. The reversal of 20102211220021 is 12002211220102.

It is a happy number.

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 20102211220021 - 2³¹ = 20100063736373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20102211219977 and 20102211220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102211220001) 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, 1435872229995 + ... + 1435872230008.

It is an arithmetic number, because the mean of its divisors is an integer number (5743488920008).

Almost surely, 2^{20102211220021} is an apocalyptic number.

It is an amenable number.

20102211220021 is a deficient number, since it is larger than the sum of its proper divisors (2871744460011).

20102211220021 is an equidigital number, since it uses as much as digits as its factorization.

20102211220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871744460010.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20102211220021 its reverse (12002211220102), we get a palindrome (32104422440123).

The spelling of 20102211220021 in words is "twenty trillion, one hundred two billion, two hundred eleven million, two hundred twenty thousand, twenty-one".