21535241522 has 4 divisors (see below), whose sum is σ = 32302862286. Its totient is φ = 10767620760.

The previous prime is 21535241491. The next prime is 21535241543. The reversal of 21535241522 is 22514253512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13110021001 + 8425220521 = 114499^2 + 91789^2 .

It is a super-4 number, since 4×21535241522⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5383810379 + ... + 5383810382.

Almost surely, 2^21535241522 is an apocalyptic number.

21535241522 is a deficient number, since it is larger than the sum of its proper divisors (10767620764).

21535241522 is a wasteful number, since it uses less digits than its factorization.

21535241522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10767620763.

The product of its digits is 24000, while the sum is 32.

The spelling of 21535241522 in words is "twenty-one billion, five hundred thirty-five million, two hundred forty-one thousand, five hundred twenty-two".