1221110022012 has 12 divisors (see below), whose sum is σ = 2849256718056. Its totient is φ = 407036674000.

The previous prime is 1221110021983. The next prime is 1221110022017. The reversal of 1221110022012 is 2102200111221.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1221110022012² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221110021982 and 1221110022000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110022017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50879584239 + ... + 50879584262.

It is an arithmetic number, because the mean of its divisors is an integer number (237438059838).

Almost surely, 2^{1221110022012} is an apocalyptic number.

1221110022012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221110022012 is an abundant number, since it is smaller than the sum of its proper divisors (1628146696044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221110022012 is a wasteful number, since it uses less digits than its factorization.

1221110022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101759168508 (or 101759168506 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221110022012 its reverse (2102200111221), we get a palindrome (3323310133233).

The spelling of 1221110022012 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, twenty-two thousand, twelve".