1221110012 has 24 divisors (see below), whose sum is σ = 2262906240. Its totient is φ = 574950960.

The previous prime is 1221109973. The next prime is 1221110071. The reversal of 1221110012 is 2100111221.

It is a super-2 number, since 2×1221110012² = 2982219322813280288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221109975 and 1221110002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35414 + ... + 60797.

It is an arithmetic number, because the mean of its divisors is an integer number (94287760).

Almost surely, 2^1221110012 is an apocalyptic number.

It is an amenable number.

1221110012 is a deficient number, since it is larger than the sum of its proper divisors (1041796228).

1221110012 is a wasteful number, since it uses less digits than its factorization.

1221110012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96401 (or 96399 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1221110012 is about 34944.3845560342. The cubic root of 1221110012 is about 1068.8536977138.

Adding to 1221110012 its reverse (2100111221), we get a palindrome (3321221233).

The spelling of 1221110012 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, twelve".