840519022221 has 6 divisors (see below), whose sum is σ = 1214083032110. Its totient is φ = 560346014808.

The previous prime is 840519022219. The next prime is 840519022229. The reversal of 840519022221 is 122220915048.

840519022221 is a `hidden beast` number, since 8 + 405 + 1 + 9 + 0 + 22 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 433768449321 + 406750572900 = 658611^2 + 637770^2 .

It is not a de Polignac number, because 840519022221 - 2¹ = 840519022219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840519022229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46695501226 + ... + 46695501243.

Almost surely, 2^840519022221 is an apocalyptic number.

It is an amenable number.

840519022221 is a deficient number, since it is larger than the sum of its proper divisors (373564009889).

840519022221 is a wasteful number, since it uses less digits than its factorization.

840519022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93391002475 (or 93391002472 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

Adding to 840519022221 its reverse (122220915048), we get a palindrome (962739937269).

The spelling of 840519022221 in words is "eight hundred forty billion, five hundred nineteen million, twenty-two thousand, two hundred twenty-one".