1920021002221 has 32 divisors (see below), whose sum is σ = 2325651211520. Its totient is φ = 1548437990400.

The previous prime is 1920021002213. The next prime is 1920021002231. The reversal of 1920021002221 is 1222001200291.

It is not a de Polignac number, because 1920021002221 - 2³ = 1920021002213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1920021002192 and 1920021002201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920021002231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18170581 + ... + 18275941.

It is an arithmetic number, because the mean of its divisors is an integer number (72676600360).

Almost surely, 2^{1920021002221} is an apocalyptic number.

It is an amenable number.

1920021002221 is a deficient number, since it is larger than the sum of its proper divisors (405630209299).

1920021002221 is a wasteful number, since it uses less digits than its factorization.

1920021002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106325.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 1920021002221 in words is "one trillion, nine hundred twenty billion, twenty-one million, two thousand, two hundred twenty-one".