21534222243513 has 96 divisors (see below), whose sum is σ = 33651023132160. Its totient is φ = 12213282332160.

The previous prime is 21534222243491. The next prime is 21534222243557. The reversal of 21534222243513 is 31534222243512.

It is not a de Polignac number, because 21534222243513 - 2¹³ = 21534222235321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21534222243563) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12118300881 + ... + 12118302657.

It is an arithmetic number, because the mean of its divisors is an integer number (350531490960).

Almost surely, 2^{21534222243513} is an apocalyptic number.

It is an amenable number.

21534222243513 is a deficient number, since it is larger than the sum of its proper divisors (12116800888647).

21534222243513 is a wasteful number, since it uses less digits than its factorization.

21534222243513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107 (or 3100 counting only the distinct ones).

The product of its digits is 345600, while the sum is 39.

Subtracting 21534222243513 from its reverse (31534222243512), we obtain a palindrome (9999999999999).

The spelling of 21534222243513 in words is "twenty-one trillion, five hundred thirty-four billion, two hundred twenty-two million, two hundred forty-three thousand, five hundred thirteen".