1881315730021 has 16 divisors (see below), whose sum is σ = 2341481990400. Its totient is φ = 1471788667008.

The previous prime is 1881315729967. The next prime is 1881315730037. The reversal of 1881315730021 is 1200375131881.

It is a cyclic number.

It is not a de Polignac number, because 1881315730021 - 2¹⁹ = 1881315205733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1881315730421) 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, 116136841 + ... + 116153038.

It is an arithmetic number, because the mean of its divisors is an integer number (146342624400).

Almost surely, 2^{1881315730021} is an apocalyptic number.

It is an amenable number.

1881315730021 is a deficient number, since it is larger than the sum of its proper divisors (460166260379).

1881315730021 is a wasteful number, since it uses less digits than its factorization.

1881315730021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232289988.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 1881315730021 in words is "one trillion, eight hundred eighty-one billion, three hundred fifteen million, seven hundred thirty thousand, twenty-one".