21110021222212 has 48 divisors (see below), whose sum is σ = 40465532016000. Its totient is φ = 9576303978240.

The previous prime is 21110021222197. The next prime is 21110021222237. The reversal of 21110021222212 is 21222212001112.

It is a self number, because there is not a number n which added to its sum of digits gives 21110021222212.

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, 17356537 + ... + 18532927.

It is an arithmetic number, because the mean of its divisors is an integer number (843031917000).

Almost surely, 2^{21110021222212} is an apocalyptic number.

It is an amenable number.

21110021222212 is a deficient number, since it is larger than the sum of its proper divisors (19355510793788).

21110021222212 is a wasteful number, since it uses less digits than its factorization.

21110021222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182316 (or 1182314 counting only the distinct ones).

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

Adding to 21110021222212 its reverse (21222212001112), we get a palindrome (42332233223324).

The spelling of 21110021222212 in words is "twenty-one trillion, one hundred ten billion, twenty-one million, two hundred twenty-two thousand, two hundred twelve".