21504040151 has 8 divisors (see below), whose sum is σ = 24004510464. Its totient is φ = 19094496120.

The previous prime is 21504040139. The next prime is 21504040157. The reversal of 21504040151 is 15104040512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21504040151 - 2⁶ = 21504040087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504040157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22731071 + ... + 22732016.

It is an arithmetic number, because the mean of its divisors is an integer number (3000563808).

Almost surely, 2^21504040151 is an apocalyptic number.

21504040151 is a deficient number, since it is larger than the sum of its proper divisors (2500470313).

21504040151 is a wasteful number, since it uses less digits than its factorization.

21504040151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45463141.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 21504040151 its reverse (15104040512), we get a palindrome (36608080663).

The spelling of 21504040151 in words is "twenty-one billion, five hundred four million, forty thousand, one hundred fifty-one".