21434222155518 has 32 divisors (see below), whose sum is σ = 47631810189600. Its totient is φ = 7144709908608.

The previous prime is 21434222155517. The next prime is 21434222155523. The reversal of 21434222155518 is 81555122243412.

21434222155518 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 422 + 215 + 5 + 5 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434222155517) 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, 14218488 + ... + 15653556.

It is an arithmetic number, because the mean of its divisors is an integer number (1488494068425).

Almost surely, 2^{21434222155518} is an apocalyptic number.

21434222155518 is an abundant number, since it is smaller than the sum of its proper divisors (26197588034082).

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

21434222155518 is a wasteful number, since it uses less digits than its factorization.

21434222155518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711673 (or 1711667 counting only the distinct ones).

The product of its digits is 768000, while the sum is 45.

The spelling of 21434222155518 in words is "twenty-one trillion, four hundred thirty-four billion, two hundred twenty-two million, one hundred fifty-five thousand, five hundred eighteen".