21012413055 has 32 divisors (see below), whose sum is σ = 34163204544. Its totient is φ = 11026845696.

The previous prime is 21012413053. The next prime is 21012413057. The reversal of 21012413055 is 55031421012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21012413053) and next prime (21012413057).

It is not a de Polignac number, because 21012413055 - 2¹ = 21012413053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012413053) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209977 + ... + 293453.

It is an arithmetic number, because the mean of its divisors is an integer number (1067600142).

Almost surely, 2^21012413055 is an apocalyptic number.

21012413055 is a deficient number, since it is larger than the sum of its proper divisors (13150791489).

21012413055 is a wasteful number, since it uses less digits than its factorization.

21012413055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83755.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21012413055 its reverse (55031421012), we get a palindrome (76043834067).

The spelling of 21012413055 in words is "twenty-one billion, twelve million, four hundred thirteen thousand, fifty-five".