21031200222 has 8 divisors (see below), whose sum is σ = 42062400456. Its totient is φ = 7010400072.

The previous prime is 21031200221. The next prime is 21031200271. The reversal of 21031200222 is 22200213012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21031200222 is an admirable number.

It is a super-2 number, since 2×21031200222² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031200221) 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, 1752600013 + ... + 1752600024.

It is an arithmetic number, because the mean of its divisors is an integer number (5257800057).

Almost surely, 2^21031200222 is an apocalyptic number.

21031200222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031200222 is a wasteful number, since it uses less digits than its factorization.

21031200222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505200042.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21031200222 its reverse (22200213012), we get a palindrome (43231413234).

The spelling of 21031200222 in words is "twenty-one billion, thirty-one million, two hundred thousand, two hundred twenty-two".