21222072535 has 8 divisors (see below), whose sum is σ = 26287986816. Its totient is φ = 16429991520.

The previous prime is 21222072511. The next prime is 21222072551. The reversal of 21222072535 is 53527022212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21222072535 - 2⁵ = 21222072503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222072497 and 21222072506.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68458144 + ... + 68458453.

It is an arithmetic number, because the mean of its divisors is an integer number (3285998352).

Almost surely, 2^21222072535 is an apocalyptic number.

21222072535 is a deficient number, since it is larger than the sum of its proper divisors (5065914281).

21222072535 is a wasteful number, since it uses less digits than its factorization.

21222072535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136916633.

The product of its (nonzero) digits is 16800, while the sum is 31.

Adding to 21222072535 its reverse (53527022212), we get a palindrome (74749094747).

The spelling of 21222072535 in words is "twenty-one billion, two hundred twenty-two million, seventy-two thousand, five hundred thirty-five".