19213121331221 has 8 divisors (see below), whose sum is σ = 19223110554144. Its totient is φ = 19203132508560.

The previous prime is 19213121331139. The next prime is 19213121331233. The reversal of 19213121331221 is 12213312131291.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19213121331221 - 2³⁴ = 19195941462037 is a prime.

It is a super-2 number, since 2×19213121331221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19213121331421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168557570 + ... + 168671516.

It is an arithmetic number, because the mean of its divisors is an integer number (2402888819268).

Almost surely, 2^{19213121331221} is an apocalyptic number.

It is an amenable number.

19213121331221 is a deficient number, since it is larger than the sum of its proper divisors (9989222923).

19213121331221 is a wasteful number, since it uses less digits than its factorization.

19213121331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200131.

The product of its digits is 3888, while the sum is 32.

The spelling of 19213121331221 in words is "nineteen trillion, two hundred thirteen billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty-one".