21863908152 has 160 divisors (see below), whose sum is σ = 64754553600. Its totient is φ = 6873097536.

The previous prime is 21863908061. The next prime is 21863908153. The reversal of 21863908152 is 25180936812.

21863908152 is a `hidden beast` number, since 2 + 1 + 8 + 639 + 0 + 8 + 1 + 5 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21863908098 and 21863908107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21863908153) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2790913 + ... + 2798735.

It is an arithmetic number, because the mean of its divisors is an integer number (404715960).

Almost surely, 2^21863908152 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 21863908152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32377276800).

21863908152 is an abundant number, since it is smaller than the sum of its proper divisors (42890645448).

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

21863908152 is a wasteful number, since it uses less digits than its factorization.

21863908152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8087 (or 8074 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 21863908152 in words is "twenty-one billion, eight hundred sixty-three million, nine hundred eight thousand, one hundred fifty-two".