21235214351 has 4 divisors (see below), whose sum is σ = 22868692392. Its totient is φ = 19601736312.

The previous prime is 21235214339. The next prime is 21235214383. The reversal of 21235214351 is 15341253212.

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

It is a cyclic number.

It is not a de Polignac number, because 21235214351 - 2¹⁴ = 21235197967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235214851) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 816739001 + ... + 816739026.

It is an arithmetic number, because the mean of its divisors is an integer number (5717173098).

Almost surely, 2^21235214351 is an apocalyptic number.

21235214351 is a deficient number, since it is larger than the sum of its proper divisors (1633478041).

21235214351 is a wasteful number, since it uses less digits than its factorization.

21235214351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633478040.

The product of its digits is 7200, while the sum is 29.

Adding to 21235214351 its reverse (15341253212), we get a palindrome (36576467563).

The spelling of 21235214351 in words is "twenty-one billion, two hundred thirty-five million, two hundred fourteen thousand, three hundred fifty-one".