2212124450021 has 4 divisors (see below), whose sum is σ = 2288404603500. Its totient is φ = 2135844296544.

The previous prime is 2212124450017. The next prime is 2212124450051. The reversal of 2212124450021 is 1200544212122.

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 681881229121 + 1530243220900 = 825761^2 + 1237030^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212124450021 - 2² = 2212124450017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212124450051) 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, 38140076696 + ... + 38140076753.

It is an arithmetic number, because the mean of its divisors is an integer number (572101150875).

Almost surely, 2^{2212124450021} is an apocalyptic number.

It is an amenable number.

2212124450021 is a deficient number, since it is larger than the sum of its proper divisors (76280153479).

2212124450021 is an equidigital number, since it uses as much as digits as its factorization.

2212124450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76280153478.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 2212124450021 its reverse (1200544212122), we get a palindrome (3412668662143).

The spelling of 2212124450021 in words is "two trillion, two hundred twelve billion, one hundred twenty-four million, four hundred fifty thousand, twenty-one".