220021011993 has 4 divisors (see below), whose sum is σ = 293361349328. Its totient is φ = 146680674660.

The previous prime is 220021011989. The next prime is 220021012009. The reversal of 220021011993 is 399110120022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 220021011993 - 2² = 220021011989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220021011993.

It is not an unprimeable number, because it can be changed into a prime (220021011923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36670168663 + ... + 36670168668.

It is an arithmetic number, because the mean of its divisors is an integer number (73340337332).

Almost surely, 2^220021011993 is an apocalyptic number.

It is an amenable number.

220021011993 is a deficient number, since it is larger than the sum of its proper divisors (73340337335).

220021011993 is an equidigital number, since it uses as much as digits as its factorization.

220021011993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73340337334.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 220021011993 in words is "two hundred twenty billion, twenty-one million, eleven thousand, nine hundred ninety-three".