21425210151 has 4 divisors (see below), whose sum is σ = 28566946872. Its totient is φ = 14283473432.

The previous prime is 21425210123. The next prime is 21425210173. The reversal of 21425210151 is 15101252412.

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 21425210151 - 2⁵ = 21425210119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425220151) 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, 3570868356 + ... + 3570868361.

It is an arithmetic number, because the mean of its divisors is an integer number (7141736718).

Almost surely, 2^21425210151 is an apocalyptic number.

21425210151 is a deficient number, since it is larger than the sum of its proper divisors (7141736721).

21425210151 is an equidigital number, since it uses as much as digits as its factorization.

21425210151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7141736720.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 21425210151 its reverse (15101252412), we get a palindrome (36526462563).

The spelling of 21425210151 in words is "twenty-one billion, four hundred twenty-five million, two hundred ten thousand, one hundred fifty-one".