21000100021222 has 32 divisors (see below), whose sum is σ = 36080424604224. Its totient is φ = 8979981926400.

The previous prime is 21000100021193. The next prime is 21000100021333. The reversal of 21000100021222 is 22212000100012.

It is a happy number.

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, 118878322 + ... + 119054842.

It is an arithmetic number, because the mean of its divisors is an integer number (1127513268882).

Almost surely, 2^{21000100021222} is an apocalyptic number.

21000100021222 is a deficient number, since it is larger than the sum of its proper divisors (15080324583002).

21000100021222 is a wasteful number, since it uses less digits than its factorization.

21000100021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195424.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21000100021222 its reverse (22212000100012), we get a palindrome (43212100121234).

The spelling of 21000100021222 in words is "twenty-one trillion, one hundred million, twenty-one thousand, two hundred twenty-two".