21148204 has 72 divisors (see below), whose sum is σ = 49814352. Its totient is φ = 7741440.

The previous prime is 21148199. The next prime is 21148207. The reversal of 21148204 is 40284112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21148207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36364 + ... + 36940.

It is an arithmetic number, because the mean of its divisors is an integer number (691866).

Almost surely, 2^21148204 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 21148204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24907176).

21148204 is an abundant number, since it is smaller than the sum of its proper divisors (28666148).

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

21148204 is a wasteful number, since it uses less digits than its factorization.

21148204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21148204 is about 4598.7176473447. The cubic root of 21148204 is about 276.5399183941.

It can be divided in two parts, 21 and 148204, that added together give a square (148225 = 385²).

The spelling of 21148204 in words is "twenty-one million, one hundred forty-eight thousand, two hundred four".