212222302421 has 16 divisors (see below), whose sum is σ = 222708400128. Its totient is φ = 201842084400.

The previous prime is 212222302393. The next prime is 212222302429. The reversal of 212222302421 is 124203222212.

It is a de Polignac number, because none of the positive numbers 2^k-212222302421 is a prime.

It is a super-2 number, since 2×212222302421² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222302429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11109140 + ... + 11128226.

It is an arithmetic number, because the mean of its divisors is an integer number (13919275008).

Almost surely, 2^212222302421 is an apocalyptic number.

It is an amenable number.

212222302421 is a deficient number, since it is larger than the sum of its proper divisors (10486097707).

212222302421 is a wasteful number, since it uses less digits than its factorization.

212222302421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21832.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 212222302421 its reverse (124203222212), we get a palindrome (336425524633).

The spelling of 212222302421 in words is "two hundred twelve billion, two hundred twenty-two million, three hundred two thousand, four hundred twenty-one".