21861792 has 48 divisors (see below), whose sum is σ = 63766080. Its totient is φ = 7286976.

The previous prime is 21861773. The next prime is 21861797. The reversal of 21861792 is 29716812.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is not an unprimeable number, because it can be changed into a prime (21861797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11788 + ... + 13515.

It is an arithmetic number, because the mean of its divisors is an integer number (1328460).

Almost surely, 2^21861792 is an apocalyptic number.

It is an amenable number.

21861792 is an abundant number, since it is smaller than the sum of its proper divisors (41904288).

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

21861792 is a wasteful number, since it uses less digits than its factorization.

21861792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25322 (or 25308 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 21861792 is about 4675.6595256712. The cubic root of 21861792 is about 279.6159360218.

The spelling of 21861792 in words is "twenty-one million, eight hundred sixty-one thousand, seven hundred ninety-two".