21150169837 has 8 divisors (see below), whose sum is σ = 21194321400. Its totient is φ = 21106043904.

The previous prime is 21150169819. The next prime is 21150169849. The reversal of 21150169837 is 73896105112.

It can be written as a sum of positive squares in 4 ways, for example, as 8032819876 + 13117349961 = 89626^2 + 114531^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21150169837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21150169793 and 21150169802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150169867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3158589 + ... + 3165277.

It is an arithmetic number, because the mean of its divisors is an integer number (2649290175).

Almost surely, 2^21150169837 is an apocalyptic number.

It is an amenable number.

21150169837 is a deficient number, since it is larger than the sum of its proper divisors (44151563).

21150169837 is an equidigital number, since it uses as much as digits as its factorization.

21150169837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12815.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 21150169837 in words is "twenty-one billion, one hundred fifty million, one hundred sixty-nine thousand, eight hundred thirty-seven".