1210012111221 has 64 divisors (see below), whose sum is σ = 1927054540800. Its totient is φ = 669396980736.

The previous prime is 1210012111201. The next prime is 1210012111261. The reversal of 1210012111221 is 1221112100121.

It is a happy number.

It is not a de Polignac number, because 1210012111221 - 2⁹ = 1210012110709 is a prime.

It is a super-2 number, since 2×1210012111221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1210012111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210012111201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90940 + ... + 1558298.

It is an arithmetic number, because the mean of its divisors is an integer number (30110227200).

Almost surely, 2^{1210012111221} is an apocalyptic number.

It is an amenable number.

1210012111221 is a deficient number, since it is larger than the sum of its proper divisors (717042429579).

1210012111221 is a wasteful number, since it uses less digits than its factorization.

1210012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467458.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1210012111221 its reverse (1221112100121), we get a palindrome (2431124211342).

The spelling of 1210012111221 in words is "one trillion, two hundred ten billion, twelve million, one hundred eleven thousand, two hundred twenty-one".