21424051151 has 4 divisors (see below), whose sum is σ = 22684289472. Its totient is φ = 20163812832.

The previous prime is 21424051147. The next prime is 21424051157. The reversal of 21424051151 is 15115042412.

It is a happy number.

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 21424051151 - 2² = 21424051147 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 21424051151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424051157) 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, 630119135 + ... + 630119168.

It is an arithmetic number, because the mean of its divisors is an integer number (5671072368).

Almost surely, 2^21424051151 is an apocalyptic number.

21424051151 is a deficient number, since it is larger than the sum of its proper divisors (1260238321).

21424051151 is a wasteful number, since it uses less digits than its factorization.

21424051151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260238320.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 21424051151 its reverse (15115042412), we get a palindrome (36539093563).

The spelling of 21424051151 in words is "twenty-one billion, four hundred twenty-four million, fifty-one thousand, one hundred fifty-one".