221112110021212 has 48 divisors (see below), whose sum is σ = 392532217507584. Its totient is φ = 108971628480000.

The previous prime is 221112110021189. The next prime is 221112110021221. The reversal of 221112110021212 is 212120011211122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221112110021212.

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, 633687948 + ... + 634036780.

It is an arithmetic number, because the mean of its divisors is an integer number (8177754531408).

Almost surely, 2^{221112110021212} is an apocalyptic number.

It is an amenable number.

221112110021212 is a deficient number, since it is larger than the sum of its proper divisors (171420107486372).

221112110021212 is a wasteful number, since it uses less digits than its factorization.

221112110021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357130 (or 357128 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221112110021212 its reverse (212120011211122), we get a palindrome (433232121232334).

The spelling of 221112110021212 in words is "two hundred twenty-one trillion, one hundred twelve billion, one hundred ten million, twenty-one thousand, two hundred twelve".