20202111010021 has 4 divisors (see below), whose sum is σ = 20303629156000. Its totient is φ = 20100592864044.

The previous prime is 20202111009979. The next prime is 20202111010069. The reversal of 20202111010021 is 12001011120202.

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 20202111010021 - 2²⁷ = 20201976792293 is a prime.

It is a super-2 number, since 2×20202111010021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202111009983 and 20202111010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202111010091) 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, 50759072691 + ... + 50759073088.

It is an arithmetic number, because the mean of its divisors is an integer number (5075907289000).

Almost surely, 2^{20202111010021} is an apocalyptic number.

It is an amenable number.

20202111010021 is a deficient number, since it is larger than the sum of its proper divisors (101518145979).

20202111010021 is a wasteful number, since it uses less digits than its factorization.

20202111010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101518145978.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20202111010021 its reverse (12001011120202), we get a palindrome (32203122130223).

The spelling of 20202111010021 in words is "twenty trillion, two hundred two billion, one hundred eleven million, ten thousand, twenty-one".