21131657201 has 8 divisors (see below), whose sum is σ = 21323788704. Its totient is φ = 20940075040.

The previous prime is 21131657159. The next prime is 21131657233. The reversal of 21131657201 is 10275613112.

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 21131657201 - 2⁶ = 21131657137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21131650201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59855 + ... + 214116.

It is an arithmetic number, because the mean of its divisors is an integer number (2665473588).

Almost surely, 2^21131657201 is an apocalyptic number.

It is an amenable number.

21131657201 is a deficient number, since it is larger than the sum of its proper divisors (192131503).

21131657201 is a wasteful number, since it uses less digits than its factorization.

21131657201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274671.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 21131657201 in words is "twenty-one billion, one hundred thirty-one million, six hundred fifty-seven thousand, two hundred one".