21154224540151 has 4 divisors (see below), whose sum is σ = 21604314424032. Its totient is φ = 20704134656272.

The previous prime is 21154224540133. The next prime is 21154224540181. The reversal of 21154224540151 is 15104542245112.

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 21154224540151 - 2²¹ = 21154222442999 is a prime.

It is a super-2 number, since 2×21154224540151² (a number of 27 digits) contains 22 as substring.

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 21154224540151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154224540121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225044941870 + ... + 225044941963.

It is an arithmetic number, because the mean of its divisors is an integer number (5401078606008).

Almost surely, 2^{21154224540151} is an apocalyptic number.

21154224540151 is a deficient number, since it is larger than the sum of its proper divisors (450089883881).

21154224540151 is an equidigital number, since it uses as much as digits as its factorization.

21154224540151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450089883880.

The product of its (nonzero) digits is 64000, while the sum is 37.

Adding to 21154224540151 its reverse (15104542245112), we get a palindrome (36258766785263).

The spelling of 21154224540151 in words is "twenty-one trillion, one hundred fifty-four billion, two hundred twenty-four million, five hundred forty thousand, one hundred fifty-one".