21655043266534 has 16 divisors (see below), whose sum is σ = 34394014157616. Its totient is φ = 10190398182400.

The previous prime is 21655043266471. The next prime is 21655043266537. The reversal of 21655043266534 is 43566234055612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655043266537) 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, 4898347 + ... + 8203894.

It is an arithmetic number, because the mean of its divisors is an integer number (2149625884851).

Almost surely, 2^{21655043266534} is an apocalyptic number.

21655043266534 is a deficient number, since it is larger than the sum of its proper divisors (12738970891082).

21655043266534 is a wasteful number, since it uses less digits than its factorization.

21655043266534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13150871.

The product of its (nonzero) digits is 15552000, while the sum is 52.

The spelling of 21655043266534 in words is "twenty-one trillion, six hundred fifty-five billion, forty-three million, two hundred sixty-six thousand, five hundred thirty-four".