21134222351 has 4 divisors (see below), whose sum is σ = 23055515304. Its totient is φ = 19212929400.

The previous prime is 21134222311. The next prime is 21134222371. The reversal of 21134222351 is 15322243112.

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 21134222351 - 2³⁰ = 20060480527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21134222351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134222311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960646460 + ... + 960646481.

It is an arithmetic number, because the mean of its divisors is an integer number (5763878826).

Almost surely, 2^21134222351 is an apocalyptic number.

21134222351 is a deficient number, since it is larger than the sum of its proper divisors (1921292953).

21134222351 is a wasteful number, since it uses less digits than its factorization.

21134222351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921292952.

The product of its digits is 2880, while the sum is 26.

Adding to 21134222351 its reverse (15322243112), we get a palindrome (36456465463).

The spelling of 21134222351 in words is "twenty-one billion, one hundred thirty-four million, two hundred twenty-two thousand, three hundred fifty-one".