21140011455 has 16 divisors (see below), whose sum is σ = 33829941600. Its totient is φ = 11272698368.

The previous prime is 21140011427. The next prime is 21140011463. The reversal of 21140011455 is 55411004112.

It is a cyclic number.

It is not a de Polignac number, because 21140011455 - 2⁷ = 21140011327 is a prime.

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, 32742 + ... + 208211.

It is an arithmetic number, because the mean of its divisors is an integer number (2114371350).

Almost surely, 2^21140011455 is an apocalyptic number.

21140011455 is a deficient number, since it is larger than the sum of its proper divisors (12689930145).

21140011455 is a wasteful number, since it uses less digits than its factorization.

21140011455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246810.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 21140011455 its reverse (55411004112), we get a palindrome (76551015567).

The spelling of 21140011455 in words is "twenty-one billion, one hundred forty million, eleven thousand, four hundred fifty-five".