20102101220021 has 4 divisors (see below), whose sum is σ = 20569591946112. Its totient is φ = 19634610493932.

The previous prime is 20102101219969. The next prime is 20102101220081. The reversal of 20102101220021 is 12002210120102.

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 20102101220021 - 2¹⁴ = 20102101203637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102101219978 and 20102101220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102101220081) 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, 233745362981 + ... + 233745363066.

It is an arithmetic number, because the mean of its divisors is an integer number (5142397986528).

Almost surely, 2^{20102101220021} is an apocalyptic number.

It is an amenable number.

20102101220021 is a deficient number, since it is larger than the sum of its proper divisors (467490726091).

20102101220021 is an equidigital number, since it uses as much as digits as its factorization.

20102101220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467490726090.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20102101220021 its reverse (12002210120102), we get a palindrome (32104311340123).

The spelling of 20102101220021 in words is "twenty trillion, one hundred two billion, one hundred one million, two hundred twenty thousand, twenty-one".