1921211838299 has 16 divisors (see below), whose sum is σ = 2136720337920. Its totient is φ = 1715430610080.

The previous prime is 1921211838283. The next prime is 1921211838421. The reversal of 1921211838299 is 9928381121291.

It is a cyclic number.

It is not a de Polignac number, because 1921211838299 - 2⁴ = 1921211838283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1921211838599) 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, 215777 + ... + 1972050.

It is an arithmetic number, because the mean of its divisors is an integer number (133545021120).

Almost surely, 2^{1921211838299} is an apocalyptic number.

1921211838299 is a deficient number, since it is larger than the sum of its proper divisors (215508499621).

1921211838299 is a wasteful number, since it uses less digits than its factorization.

1921211838299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190050.

The product of its digits is 1119744, while the sum is 56.

The spelling of 1921211838299 in words is "one trillion, nine hundred twenty-one billion, two hundred eleven million, eight hundred thirty-eight thousand, two hundred ninety-nine".