21272627261 has 8 divisors (see below), whose sum is σ = 21329568000. Its totient is φ = 21215729920.

The previous prime is 21272627249. The next prime is 21272627263. The reversal of 21272627261 is 16272627212.

It is a happy number.

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 21272627261 - 2³⁰ = 20198885437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21272627263) 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 7 ways as a sum of consecutive naturals, for example, 1127060 + ... + 1145778.

It is an arithmetic number, because the mean of its divisors is an integer number (2666196000).

Almost surely, 2^21272627261 is an apocalyptic number.

It is an amenable number.

21272627261 is a deficient number, since it is larger than the sum of its proper divisors (56940739).

21272627261 is a wasteful number, since it uses less digits than its factorization.

21272627261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21699.

The product of its digits is 56448, while the sum is 38.

The spelling of 21272627261 in words is "twenty-one billion, two hundred seventy-two million, six hundred twenty-seven thousand, two hundred sixty-one".