21460212 has 18 divisors (see below), whose sum is σ = 54246738. Its totient is φ = 7153392.

The previous prime is 21460207. The next prime is 21460213. The reversal of 21460212 is 21206412.

It can be written as a sum of positive squares in only one way, i.e., 20034576 + 1425636 = 4476^2 + 1194^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 298023 + ... + 298094.

Almost surely, 2^21460212 is an apocalyptic number.

It is an amenable number.

21460212 is an abundant number, since it is smaller than the sum of its proper divisors (32786526).

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

21460212 is a wasteful number, since it uses less digits than its factorization.

21460212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596127 (or 596122 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21460212 is about 4632.5168105469. The cubic root of 21460212 is about 277.8932530142.

Adding to 21460212 its reverse (21206412), we get a palindrome (42666624).

The spelling of 21460212 in words is "twenty-one million, four hundred sixty thousand, two hundred twelve".