21230132 has 72 divisors (see below), whose sum is σ = 48454560. Its totient is φ = 8043840.

The previous prime is 21230129. The next prime is 21230141. The reversal of 21230132 is 23103212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92594 + ... + 92822.

It is an arithmetic number, because the mean of its divisors is an integer number (672980).

Almost surely, 2^21230132 is an apocalyptic number.

21230132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21230132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24227280).

21230132 is an abundant number, since it is smaller than the sum of its proper divisors (27224428).

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

21230132 is a wasteful number, since it uses less digits than its factorization.

21230132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21230132 is about 4607.6167375336. The cubic root of 21230132 is about 276.8965628382.

Adding to 21230132 its reverse (23103212), we get a palindrome (44333344).

Subtracting 21230132 from its reverse (23103212), we obtain a triangular number (1873080 = T₁₉₃₅).

The spelling of 21230132 in words is "twenty-one million, two hundred thirty thousand, one hundred thirty-two".