21524412151 has 4 divisors (see below), whose sum is σ = 23481176904. Its totient is φ = 19567647400.

The previous prime is 21524412121. The next prime is 21524412157. The reversal of 21524412151 is 15121442512.

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 21524412151 - 2³³ = 12934477559 is a prime.

It is a super-2 number, since 2×21524412151² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524412157) 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, 978382360 + ... + 978382381.

It is an arithmetic number, because the mean of its divisors is an integer number (5870294226).

Almost surely, 2^21524412151 is an apocalyptic number.

21524412151 is a deficient number, since it is larger than the sum of its proper divisors (1956764753).

21524412151 is a wasteful number, since it uses less digits than its factorization.

21524412151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956764752.

The product of its digits is 3200, while the sum is 28.

Adding to 21524412151 its reverse (15121442512), we get a palindrome (36645854663).

The spelling of 21524412151 in words is "twenty-one billion, five hundred twenty-four million, four hundred twelve thousand, one hundred fifty-one".