1221109999948 has 12 divisors (see below), whose sum is σ = 2137444041712. Its totient is φ = 610411702320.

The previous prime is 1221109999939. The next prime is 1221109999987. The reversal of 1221109999948 is 8499999011221.

It is a happy number.

It is a super-2 number, since 2×1221109999948² (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 1221109999948.

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, 35805240 + ... + 35839327.

Almost surely, 2^{1221109999948} is an apocalyptic number.

It is an amenable number.

1221109999948 is a deficient number, since it is larger than the sum of its proper divisors (916334041764).

1221109999948 is a wasteful number, since it uses less digits than its factorization.

1221109999948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71648832 (or 71648830 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 64.

The spelling of 1221109999948 in words is "one trillion, two hundred twenty-one billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred forty-eight".