21124202222 has 4 divisors (see below), whose sum is σ = 31686303336. Its totient is φ = 10562101110.

The previous prime is 21124202221. The next prime is 21124202233. The reversal of 21124202222 is 22220242112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21124202194 and 21124202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124202221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281050554 + ... + 5281050557.

It is an arithmetic number, because the mean of its divisors is an integer number (7921575834).

Almost surely, 2^21124202222 is an apocalyptic number.

21124202222 is a deficient number, since it is larger than the sum of its proper divisors (10562101114).

21124202222 is a wasteful number, since it uses less digits than its factorization.

21124202222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10562101113.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21124202222 its reverse (22220242112), we get a palindrome (43344444334).

The spelling of 21124202222 in words is "twenty-one billion, one hundred twenty-four million, two hundred two thousand, two hundred twenty-two".