21437532 has 36 divisors (see below), whose sum is σ = 55113240. Its totient is φ = 7024032.

The previous prime is 21437531. The next prime is 21437573. The reversal of 21437532 is 23573412.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21437496 and 21437505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21437531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2923 + ... + 7170.

Almost surely, 2^21437532 is an apocalyptic number.

It is an amenable number.

21437532 is an abundant number, since it is smaller than the sum of its proper divisors (33675708).

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

21437532 is a wasteful number, since it uses less digits than its factorization.

21437532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10162 (or 10157 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 21437532 is about 4630.0682500369. The cubic root of 21437532 is about 277.7953223170.

The spelling of 21437532 in words is "twenty-one million, four hundred thirty-seven thousand, five hundred thirty-two".