21807211350 has 96 divisors (see below), whose sum is σ = 56041413120. Its totient is φ = 5607987840.

The previous prime is 21807211343. The next prime is 21807211351. The reversal of 21807211350 is 5311270812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21807211351) 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 47 ways as a sum of consecutive naturals, for example, 488152 + ... + 530948.

It is an arithmetic number, because the mean of its divisors is an integer number (583764720).

Almost surely, 2^21807211350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21807211350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28020706560).

21807211350 is an abundant number, since it is smaller than the sum of its proper divisors (34234201770).

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

21807211350 is a wasteful number, since it uses less digits than its factorization.

21807211350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42934 (or 42929 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The spelling of 21807211350 in words is "twenty-one billion, eight hundred seven million, two hundred eleven thousand, three hundred fifty".