21250011345154 has 8 divisors (see below), whose sum is σ = 33750018018828. Its totient is φ = 10000005338880.

The previous prime is 21250011345151. The next prime is 21250011345161. The reversal of 21250011345154 is 45154311005212.

It can be written as a sum of positive squares in 2 ways, for example, as 21203860705225 + 46150639929 = 4604765^2 + 214827^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 625000333681 = 21250011345154 / (2 + 1 + 2 + 5 + 0 + 0 + 1 + 1 + 3 + 4 + 5 + 1 + 5 + 4).

It is not an unprimeable number, because it can be changed into a prime (21250011345151) 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 3 ways as a sum of consecutive naturals, for example, 312500166807 + ... + 312500166874.

Almost surely, 2^{21250011345154} is an apocalyptic number.

21250011345154 is a deficient number, since it is larger than the sum of its proper divisors (12500006673674).

21250011345154 is a wasteful number, since it uses less digits than its factorization.

21250011345154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625000333700.

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 21250011345154 in words is "twenty-one trillion, two hundred fifty billion, eleven million, three hundred forty-five thousand, one hundred fifty-four".