21526416436 has 48 divisors (see below), whose sum is σ = 44029923840. Its totient is φ = 9018547200.

The previous prime is 21526416421. The next prime is 21526416437. The reversal of 21526416436 is 63461462512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21526416437) 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, 175236 + ... + 271588.

It is an arithmetic number, because the mean of its divisors is an integer number (917290080).

Almost surely, 2^21526416436 is an apocalyptic number.

It is an amenable number.

21526416436 is an abundant number, since it is smaller than the sum of its proper divisors (22503507404).

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

21526416436 is a wasteful number, since it uses less digits than its factorization.

21526416436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96544 (or 96542 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

Adding to 21526416436 its reverse (63461462512), we get a palindrome (84987878948).

The spelling of 21526416436 in words is "twenty-one billion, five hundred twenty-six million, four hundred sixteen thousand, four hundred thirty-six".