21000023055 has 24 divisors (see below), whose sum is σ = 39709135440. Its totient is φ = 10181829120.

The previous prime is 21000023027. The next prime is 21000023071. The reversal of 21000023055 is 55032000012.

It is a happy number.

It is not a de Polignac number, because 21000023055 - 2⁶ = 21000022991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21211650 + ... + 21212639.

It is an arithmetic number, because the mean of its divisors is an integer number (1654547310).

Almost surely, 2^21000023055 is an apocalyptic number.

21000023055 is a deficient number, since it is larger than the sum of its proper divisors (18709112385).

21000023055 is a wasteful number, since it uses less digits than its factorization.

21000023055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42424311 (or 42424308 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

Adding to 21000023055 its reverse (55032000012), we get a palindrome (76032023067).

The spelling of 21000023055 in words is "twenty-one billion, twenty-three thousand, fifty-five".