21255456110 has 32 divisors (see below), whose sum is σ = 44015104512. Its totient is φ = 7239319200.

The previous prime is 21255456107. The next prime is 21255456113. The reversal of 21255456110 is 1165455212.

It is an interprime number because it is at equal distance from previous prime (21255456107) and next prime (21255456113).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255456113) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 994892 + ... + 1016031.

It is an arithmetic number, because the mean of its divisors is an integer number (1375472016).

Almost surely, 2^21255456110 is an apocalyptic number.

21255456110 is an abundant number, since it is smaller than the sum of its proper divisors (22759648402).

21255456110 is a wasteful number, since it uses less digits than its factorization.

21255456110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011088.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 21255456110 in words is "twenty-one billion, two hundred fifty-five million, four hundred fifty-six thousand, one hundred ten".