21831433019394 has 16 divisors (see below), whose sum is σ = 43675584654432. Its totient is φ = 7275024570528.

The previous prime is 21831433019387. The next prime is 21831433019399. The reversal of 21831433019394 is 49391033413812.

It is a happy number.

It is a super-3 number, since 3×21831433019394³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21831433019399) 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, 529920004 + ... + 529961199.

It is an arithmetic number, because the mean of its divisors is an integer number (2729724040902).

Almost surely, 2^{21831433019394} is an apocalyptic number.

21831433019394 is an abundant number, since it is smaller than the sum of its proper divisors (21844151635038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21831433019394 is a wasteful number, since it uses less digits than its factorization.

21831433019394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059884641.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 21831433019394 in words is "twenty-one trillion, eight hundred thirty-one billion, four hundred thirty-three million, nineteen thousand, three hundred ninety-four".