21434342153 has 16 divisors (see below), whose sum is σ = 25447322880. Its totient is φ = 17671718400.

The previous prime is 21434342147. The next prime is 21434342161. The reversal of 21434342153 is 35124343412.

It is a de Polignac number, because none of the positive numbers 2^k-21434342153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21434342113) 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, 505568 + ... + 546321.

It is an arithmetic number, because the mean of its divisors is an integer number (1590457680).

Almost surely, 2^21434342153 is an apocalyptic number.

It is an amenable number.

21434342153 is a deficient number, since it is larger than the sum of its proper divisors (4012980727).

21434342153 is a wasteful number, since it uses less digits than its factorization.

21434342153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052008.

The product of its digits is 34560, while the sum is 32.

Adding to 21434342153 its reverse (35124343412), we get a palindrome (56558685565).

The spelling of 21434342153 in words is "twenty-one billion, four hundred thirty-four million, three hundred forty-two thousand, one hundred fifty-three".