21055245112 has 16 divisors (see below), whose sum is σ = 43067547000. Its totient is φ = 9570565920.

The previous prime is 21055245103. The next prime is 21055245121. The reversal of 21055245112 is 21154255012.

It is an interprime number because it is at equal distance from previous prime (21055245103) and next prime (21055245121).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119631987 + ... + 119632162.

Almost surely, 2^21055245112 is an apocalyptic number.

21055245112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21055245112 is an abundant number, since it is smaller than the sum of its proper divisors (22012301888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21055245112 is a wasteful number, since it uses less digits than its factorization.

21055245112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239264166 (or 239264162 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The spelling of 21055245112 in words is "twenty-one billion, fifty-five million, two hundred forty-five thousand, one hundred twelve".