21120022001222 has 32 divisors (see below), whose sum is σ = 34327654653600. Its totient is φ = 9706564804608.

The previous prime is 21120022001201. The next prime is 21120022001231. The reversal of 21120022001222 is 22210022002112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21120022001222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11747354 + ... + 13425362.

It is an arithmetic number, because the mean of its divisors is an integer number (1072739207925).

Almost surely, 2^{21120022001222} is an apocalyptic number.

21120022001222 is a deficient number, since it is larger than the sum of its proper divisors (13207632652378).

21120022001222 is a wasteful number, since it uses less digits than its factorization.

21120022001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686680.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21120022001222 its reverse (22210022002112), we get a palindrome (43330044003334).

The spelling of 21120022001222 in words is "twenty-one trillion, one hundred twenty billion, twenty-two million, one thousand, two hundred twenty-two".