21190152 has 16 divisors (see below), whose sum is σ = 52975440. Its totient is φ = 7063376.

The previous prime is 21190151. The next prime is 21190171. The reversal of 21190152 is 25109112.

It is not an unprimeable number, because it can be changed into a prime (21190151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441438 + ... + 441485.

It is an arithmetic number, because the mean of its divisors is an integer number (3310965).

Almost surely, 2^21190152 is an apocalyptic number.

It is an amenable number.

21190152 is an abundant number, since it is smaller than the sum of its proper divisors (31785288).

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

21190152 is a wasteful number, since it uses less digits than its factorization.

21190152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882932 (or 882928 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21190152 is about 4603.2762246035. The cubic root of 21190152 is about 276.7226389553.

Adding to 21190152 its reverse (25109112), we get a palindrome (46299264).

The spelling of 21190152 in words is "twenty-one million, one hundred ninety thousand, one hundred fifty-two".