21405022235 has 48 divisors (see below), whose sum is σ = 28753457760. Its totient is φ = 15226014720.

The previous prime is 21405022193. The next prime is 21405022237. The reversal of 21405022235 is 53222050412.

It is not a de Polignac number, because 21405022235 - 2²⁶ = 21337913371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21405022237) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5443220 + ... + 5447150.

It is an arithmetic number, because the mean of its divisors is an integer number (599030370).

Almost surely, 2^21405022235 is an apocalyptic number.

21405022235 is a deficient number, since it is larger than the sum of its proper divisors (7348435525).

21405022235 is a wasteful number, since it uses less digits than its factorization.

21405022235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076 (or 4029 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21405022235 its reverse (53222050412), we get a palindrome (74627072647).

The spelling of 21405022235 in words is "twenty-one billion, four hundred five million, twenty-two thousand, two hundred thirty-five".