21001113001222 has 16 divisors (see below), whose sum is σ = 31634495901360. Its totient is φ = 10456367258592.

The previous prime is 21001113001177. The next prime is 21001113001259. The reversal of 21001113001222 is 22210031110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001113001196 and 21001113001205.

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, 21068472 + ... + 22042747.

It is an arithmetic number, because the mean of its divisors is an integer number (1977155993835).

Almost surely, 2^{21001113001222} is an apocalyptic number.

21001113001222 is a deficient number, since it is larger than the sum of its proper divisors (10633382900138).

21001113001222 is a wasteful number, since it uses less digits than its factorization.

21001113001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43112247.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21001113001222 its reverse (22210031110012), we get a palindrome (43211144111234).

The spelling of 21001113001222 in words is "twenty-one trillion, one billion, one hundred thirteen million, one thousand, two hundred twenty-two".