21150131087 has 8 divisors (see below), whose sum is σ = 21224700240. Its totient is φ = 21075626880.

The previous prime is 21150131077. The next prime is 21150131153. The reversal of 21150131087 is 78013105112.

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 21150131087 - 2¹⁴ = 21150114703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150131017) 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, 689693 + ... + 719705.

It is an arithmetic number, because the mean of its divisors is an integer number (2653087530).

Almost surely, 2^21150131087 is an apocalyptic number.

21150131087 is a deficient number, since it is larger than the sum of its proper divisors (74569153).

21150131087 is a wasteful number, since it uses less digits than its factorization.

21150131087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32473.

The product of its (nonzero) digits is 1680, while the sum is 29.

Adding to 21150131087 its reverse (78013105112), we get a palindrome (99163236199).

The spelling of 21150131087 in words is "twenty-one billion, one hundred fifty million, one hundred thirty-one thousand, eighty-seven".