21063262655 has 16 divisors (see below), whose sum is σ = 25655867424. Its totient is φ = 16599004800.

The previous prime is 21063262639. The next prime is 21063262681. The reversal of 21063262655 is 55626236012.

It is not a de Polignac number, because 21063262655 - 2⁴ = 21063262639 is a prime.

It is a super-2 number, since 2×21063262655² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6377 + ... + 205346.

It is an arithmetic number, because the mean of its divisors is an integer number (1603491714).

Almost surely, 2^21063262655 is an apocalyptic number.

21063262655 is a deficient number, since it is larger than the sum of its proper divisors (4592604769).

21063262655 is a wasteful number, since it uses less digits than its factorization.

21063262655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212026.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 21063262655 its reverse (55626236012), we get a palindrome (76689498667).

The spelling of 21063262655 in words is "twenty-one billion, sixty-three million, two hundred sixty-two thousand, six hundred fifty-five".