21216462 has 16 divisors (see below), whose sum is σ = 43802112. Its totient is φ = 6843960.

The previous prime is 21216457. The next prime is 21216467. The reversal of 21216462 is 26461212.

It is an interprime number because it is at equal distance from previous prime (21216457) and next prime (21216467).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56848 + ... + 57219.

It is an arithmetic number, because the mean of its divisors is an integer number (2737632).

Almost surely, 2^21216462 is an apocalyptic number.

21216462 is an abundant number, since it is smaller than the sum of its proper divisors (22585650).

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

21216462 is a wasteful number, since it uses less digits than its factorization.

21216462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114103.

The product of its digits is 1152, while the sum is 24.

The square root of 21216462 is about 4606.1330853548. The cubic root of 21216462 is about 276.8371192021.

Adding to 21216462 its reverse (26461212), we get a palindrome (47677674).

It can be divided in two parts, 212164 and 62, that added together give a triangular number (212226 = T₆₅₁).

The spelling of 21216462 in words is "twenty-one million, two hundred sixteen thousand, four hundred sixty-two".