2112201010021 has 4 divisors (see below), whose sum is σ = 2148001027200. Its totient is φ = 2076400992844.

The previous prime is 2112201010001. The next prime is 2112201010037. The reversal of 2112201010021 is 1200101022112.

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 2112201010021 - 2⁹ = 2112201009509 is a prime.

It is a super-2 number, since 2×2112201010021² (a number of 25 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 = 2112201009983 and 2112201010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112201010001) 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, 17900008501 + ... + 17900008618.

It is an arithmetic number, because the mean of its divisors is an integer number (537000256800).

Almost surely, 2^{2112201010021} is an apocalyptic number.

It is an amenable number.

2112201010021 is a deficient number, since it is larger than the sum of its proper divisors (35800017179).

2112201010021 is an equidigital number, since it uses as much as digits as its factorization.

2112201010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35800017178.

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

Adding to 2112201010021 its reverse (1200101022112), we get a palindrome (3312302032133).

The spelling of 2112201010021 in words is "two trillion, one hundred twelve billion, two hundred one million, ten thousand, twenty-one".