21771747511 has 8 divisors (see below), whose sum is σ = 21802987440. Its totient is φ = 21740528832.

The previous prime is 21771747479. The next prime is 21771747523. The reversal of 21771747511 is 11574717712.

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 21771747511 - 2⁵ = 21771747479 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 (21771742511) 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, 3581971 + ... + 3588043.

It is an arithmetic number, because the mean of its divisors is an integer number (2725373430).

Almost surely, 2^21771747511 is an apocalyptic number.

21771747511 is a deficient number, since it is larger than the sum of its proper divisors (31239929).

21771747511 is a wasteful number, since it uses less digits than its factorization.

21771747511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10625.

The product of its digits is 96040, while the sum is 43.

The spelling of 21771747511 in words is "twenty-one billion, seven hundred seventy-one million, seven hundred forty-seven thousand, five hundred eleven".