21532210 has 32 divisors (see below), whose sum is σ = 45826560. Its totient is φ = 7127232.

The previous prime is 21532201. The next prime is 21532219. The reversal of 21532210 is 1223512.

It is an interprime number because it is at equal distance from previous prime (21532201) and next prime (21532219).

It is not an unprimeable number, because it can be changed into a prime (21532219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3274 + ... + 7333.

It is an arithmetic number, because the mean of its divisors is an integer number (1432080).

Almost surely, 2^21532210 is an apocalyptic number.

21532210 is an abundant number, since it is smaller than the sum of its proper divisors (24294350).

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

21532210 is a wasteful number, since it uses less digits than its factorization.

21532210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10650.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 21532210 is about 4640.2812414766. The cubic root of 21532210 is about 278.2036790407.

Adding to 21532210 its reverse (1223512), we get a palindrome (22755722).

The spelling of 21532210 in words is "twenty-one million, five hundred thirty-two thousand, two hundred ten".