21273001161 has 8 divisors (see below), whose sum is σ = 28364848704. Its totient is φ = 14181577200.

The previous prime is 21273001157. The next prime is 21273001171. The reversal of 21273001161 is 16110037212.

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

It is not a de Polignac number, because 21273001161 - 2² = 21273001157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21273001171) 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, 40011 + ... + 210111.

It is an arithmetic number, because the mean of its divisors is an integer number (3545606088).

Almost surely, 2^21273001161 is an apocalyptic number.

It is an amenable number.

21273001161 is a deficient number, since it is larger than the sum of its proper divisors (7091847543).

21273001161 is a wasteful number, since it uses less digits than its factorization.

21273001161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211791.

The product of its (nonzero) digits is 504, while the sum is 24.

Adding to 21273001161 its reverse (16110037212), we get a palindrome (37383038373).

The spelling of 21273001161 in words is "twenty-one billion, two hundred seventy-three million, one thousand, one hundred sixty-one".