21343215153 has 32 divisors (see below), whose sum is σ = 31230501120. Its totient is φ = 12885200640.

The previous prime is 21343215149. The next prime is 21343215247. The reversal of 21343215153 is 35151234312.

It is not a de Polignac number, because 21343215153 - 2² = 21343215149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21343215153.

It is not an unprimeable number, because it can be changed into a prime (21343215053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 913900 + ... + 936962.

It is an arithmetic number, because the mean of its divisors is an integer number (975953160).

Almost surely, 2^21343215153 is an apocalyptic number.

It is an amenable number.

21343215153 is a deficient number, since it is larger than the sum of its proper divisors (9887285967).

21343215153 is a wasteful number, since it uses less digits than its factorization.

21343215153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23529.

The product of its digits is 10800, while the sum is 30.

Adding to 21343215153 its reverse (35151234312), we get a palindrome (56494449465).

The spelling of 21343215153 in words is "twenty-one billion, three hundred forty-three million, two hundred fifteen thousand, one hundred fifty-three".