1220100210978 has 48 divisors (see below), whose sum is σ = 2691681974688. Its totient is φ = 368420817600.

The previous prime is 1220100210977. The next prime is 1220100211019. The reversal of 1220100210978 is 8790120010221.

It is a super-2 number, since 2×1220100210978² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1220100210977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2763763 + ... + 3174678.

It is an arithmetic number, because the mean of its divisors is an integer number (56076707806).

Almost surely, 2^{1220100210978} is an apocalyptic number.

1220100210978 is an abundant number, since it is smaller than the sum of its proper divisors (1471581763710).

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

1220100210978 is a wasteful number, since it uses less digits than its factorization.

1220100210978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5938751 (or 5938740 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The spelling of 1220100210978 in words is "one trillion, two hundred twenty billion, one hundred million, two hundred ten thousand, nine hundred seventy-eight".