1821213860073 has 16 divisors (see below), whose sum is σ = 2464606448640. Its totient is φ = 1195983073296.

The previous prime is 1821213860069. The next prime is 1821213860077. The reversal of 1821213860073 is 3700683121281.

It is an interprime number because it is at equal distance from previous prime (1821213860069) and next prime (1821213860077).

It is not a de Polignac number, because 1821213860073 - 2² = 1821213860069 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1821213860077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7111588 + ... + 7363226.

It is an arithmetic number, because the mean of its divisors is an integer number (154037903040).

Almost surely, 2^{1821213860073} is an apocalyptic number.

It is an amenable number.

1821213860073 is a deficient number, since it is larger than the sum of its proper divisors (643392588567).

1821213860073 is a wasteful number, since it uses less digits than its factorization.

1821213860073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287716.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 1821213860073 in words is "one trillion, eight hundred twenty-one billion, two hundred thirteen million, eight hundred sixty thousand, seventy-three".