21755092212 has 192 divisors, whose sum is σ = 65144217600. Its totient is φ = 6150142080.

The previous prime is 21755092201. The next prime is 21755092273. The reversal of 21755092212 is 21229055712.

21755092212 is a `hidden beast` number, since 2 + 1 + 7 + 550 + 92 + 2 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50475637 + ... + 50476067.

It is an arithmetic number, because the mean of its divisors is an integer number (339292800).

Almost surely, 2^21755092212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21755092212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32572108800).

21755092212 is an abundant number, since it is smaller than the sum of its proper divisors (43389125388).

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

21755092212 is a wasteful number, since it uses less digits than its factorization.

21755092212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003 (or 995 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 21755092212 in words is "twenty-one billion, seven hundred fifty-five million, ninety-two thousand, two hundred twelve".