220121019978 has 8 divisors (see below), whose sum is σ = 440242039968. Its totient is φ = 73373673324.

The previous prime is 220121019917. The next prime is 220121019983. The reversal of 220121019978 is 879910121022.

It is a sphenic number, since it is the product of 3 distinct primes.

220121019978 is an admirable 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, 18343418326 + ... + 18343418337.

It is an arithmetic number, because the mean of its divisors is an integer number (55030254996).

Almost surely, 2^220121019978 is an apocalyptic number.

220121019978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

220121019978 is a wasteful number, since it uses less digits than its factorization.

220121019978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36686836668.

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 220121019978 in words is "two hundred twenty billion, one hundred twenty-one million, nineteen thousand, nine hundred seventy-eight".