21727240611 has 16 divisors (see below), whose sum is σ = 29313309600. Its totient is φ = 14313201408.

The previous prime is 21727240607. The next prime is 21727240637. The reversal of 21727240611 is 11604272712.

It is not a de Polignac number, because 21727240611 - 2² = 21727240607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21727240111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421245 + ... + 470001.

It is an arithmetic number, because the mean of its divisors is an integer number (1832081850).

Almost surely, 2^21727240611 is an apocalyptic number.

21727240611 is a deficient number, since it is larger than the sum of its proper divisors (7586068989).

21727240611 is a wasteful number, since it uses less digits than its factorization.

21727240611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50518.

The product of its (nonzero) digits is 9408, while the sum is 33.

The spelling of 21727240611 in words is "twenty-one billion, seven hundred twenty-seven million, two hundred forty thousand, six hundred eleven".