202212001000021 has 4 divisors (see below), whose sum is σ = 202212031268044. Its totient is φ = 202211970732000.

The previous prime is 202212000999991. The next prime is 202212001000027. The reversal of 202212001000021 is 120000100212202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 200021337552100 + 2190663447921 = 14142890^2 + 1480089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202212001000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202212000999965 and 202212001000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202212001000027) 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, 202110 + ... + 20111311.

It is an arithmetic number, because the mean of its divisors is an integer number (50553007817011).

Almost surely, 2^{202212001000021} is an apocalyptic number.

It is an amenable number.

202212001000021 is a deficient number, since it is larger than the sum of its proper divisors (30268023).

202212001000021 is an equidigital number, since it uses as much as digits as its factorization.

202212001000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30268022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202212001000021 its reverse (120000100212202), we get a palindrome (322212101212223).

The spelling of 202212001000021 in words is "two hundred two trillion, two hundred twelve billion, one million, twenty-one", and thus it is an aban number.