21021111220222 has 16 divisors (see below), whose sum is σ = 31831337316240. Its totient is φ = 10411135520128.

The previous prime is 21021111220157. The next prime is 21021111220253. The reversal of 21021111220222 is 22202211112012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021111220222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117428347 + ... + 117607222.

It is an arithmetic number, because the mean of its divisors is an integer number (1989458582265).

Almost surely, 2^{21021111220222} is an apocalyptic number.

21021111220222 is a deficient number, since it is larger than the sum of its proper divisors (10810226096018).

21021111220222 is a wasteful number, since it uses less digits than its factorization.

21021111220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235035995.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021111220222 its reverse (22202211112012), we get a palindrome (43223322332234).

The spelling of 21021111220222 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-two".