21466011655 has 24 divisors (see below), whose sum is σ = 28327589136. Its totient is φ = 15604068480.

The previous prime is 21466011643. The next prime is 21466011661. The reversal of 21466011655 is 55611066412.

It is not a de Polignac number, because 21466011655 - 2¹³ = 21466003463 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1440352 + ... + 1455178.

It is an arithmetic number, because the mean of its divisors is an integer number (1180316214).

Almost surely, 2^21466011655 is an apocalyptic number.

21466011655 is a deficient number, since it is larger than the sum of its proper divisors (6861577481).

21466011655 is a wasteful number, since it uses less digits than its factorization.

21466011655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17247 (or 17236 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 21466011655 in words is "twenty-one billion, four hundred sixty-six million, eleven thousand, six hundred fifty-five".