1822112021 has 4 divisors (see below), whose sum is σ = 1884943500. Its totient is φ = 1759280544.

The previous prime is 1822111999. The next prime is 1822112023. The reversal of 1822112021 is 1202112281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313644100 + 1508467921 = 17710^2 + 38839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1822112021 - 2³⁰ = 748370197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1822111984 and 1822112002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822112023) 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, 31415696 + ... + 31415753.

It is an arithmetic number, because the mean of its divisors is an integer number (471235875).

Almost surely, 2^1822112021 is an apocalyptic number.

It is an amenable number.

1822112021 is a deficient number, since it is larger than the sum of its proper divisors (62831479).

1822112021 is an equidigital number, since it uses as much as digits as its factorization.

1822112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62831478.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1822112021 is about 42686.2041062449. The cubic root of 1822112021 is about 1221.4012433712.

The spelling of 1822112021 in words is "one billion, eight hundred twenty-two million, one hundred twelve thousand, twenty-one".