21762104 has 64 divisors (see below), whose sum is σ = 50803200. Its totient is φ = 8509824.

The previous prime is 21762089. The next prime is 21762107. The reversal of 21762104 is 40126712.

It is a self number, because there is not a number n which added to its sum of digits gives 21762104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21762107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121487 + ... + 121665.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^21762104 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 21762104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25401600).

21762104 is an abundant number, since it is smaller than the sum of its proper divisors (29041096).

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

21762104 is a wasteful number, since it uses less digits than its factorization.

21762104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21762104 is about 4664.9870310645. The cubic root of 21762104 is about 279.1902797086.

Adding to 21762104 its reverse (40126712), we get a palindrome (61888816).

The spelling of 21762104 in words is "twenty-one million, seven hundred sixty-two thousand, one hundred four".