1221111002012 has 12 divisors (see below), whose sum is σ = 2331211913016. Its totient is φ = 555050455440.

The previous prime is 1221111001991. The next prime is 1221111002021. The reversal of 1221111002012 is 2102001111221.

It is a super-2 number, since 2×1221111002012² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13876261343 + ... + 13876261430.

It is an arithmetic number, because the mean of its divisors is an integer number (194267659418).

Almost surely, 2^{1221111002012} is an apocalyptic number.

It is an amenable number.

1221111002012 is a deficient number, since it is larger than the sum of its proper divisors (1110100911004).

1221111002012 is a wasteful number, since it uses less digits than its factorization.

1221111002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27752522788 (or 27752522786 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221111002012 its reverse (2102001111221), we get a palindrome (3323112113233).

The spelling of 1221111002012 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, two thousand, twelve".