21111010222 has 4 divisors (see below), whose sum is σ = 31666515336. Its totient is φ = 10555505110.

The previous prime is 21111010171. The next prime is 21111010223. The reversal of 21111010222 is 22201011112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111010223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277752554 + ... + 5277752557.

It is an arithmetic number, because the mean of its divisors is an integer number (7916628834).

Almost surely, 2^21111010222 is an apocalyptic number.

21111010222 is a deficient number, since it is larger than the sum of its proper divisors (10555505114).

21111010222 is a wasteful number, since it uses less digits than its factorization.

21111010222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10555505113.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21111010222 its reverse (22201011112), we get a palindrome (43312021334).

The spelling of 21111010222 in words is "twenty-one billion, one hundred eleven million, ten thousand, two hundred twenty-two".