21150231500161 has 8 divisors (see below), whose sum is σ = 21625724229984. Its totient is φ = 20679992833920.

The previous prime is 21150231500147. The next prime is 21150231500213. The reversal of 21150231500161 is 16100513205112.

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 21150231500161 - 2⁴¹ = 18951208244609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21150231500141) 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, 1313507755 + ... + 1313523856.

It is an arithmetic number, because the mean of its divisors is an integer number (2703215528748).

Almost surely, 2^{21150231500161} is an apocalyptic number.

It is an amenable number.

21150231500161 is a deficient number, since it is larger than the sum of its proper divisors (475492729823).

21150231500161 is an equidigital number, since it uses as much as digits as its factorization.

21150231500161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627031791.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 21150231500161 its reverse (16100513205112), we get a palindrome (37250744705273).

The spelling of 21150231500161 in words is "twenty-one trillion, one hundred fifty billion, two hundred thirty-one million, five hundred thousand, one hundred sixty-one".