21532270 has 8 divisors (see below), whose sum is σ = 38758104. Its totient is φ = 8612904.

The previous prime is 21532249. The next prime is 21532271. The reversal of 21532270 is 7223512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532271) 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, 1076604 + ... + 1076623.

It is an arithmetic number, because the mean of its divisors is an integer number (4844763).

Almost surely, 2^21532270 is an apocalyptic number.

21532270 is a deficient number, since it is larger than the sum of its proper divisors (17225834).

21532270 is a wasteful number, since it uses less digits than its factorization.

21532270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153234.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21532270 is about 4640.2877065975. The cubic root of 21532270 is about 278.2039374474.

Adding to 21532270 its reverse (7223512), we get a palindrome (28755782).

The spelling of 21532270 in words is "twenty-one million, five hundred thirty-two thousand, two hundred seventy".