21489462 has 64 divisors (see below), whose sum is σ = 51364800. Its totient is φ = 6741792.

The previous prime is 21489451. The next prime is 21489463. The reversal of 21489462 is 26498412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1264078 + ... + 1264094.

It is an arithmetic number, because the mean of its divisors is an integer number (802575).

Almost surely, 2^21489462 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21489462, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25682400).

21489462 is an abundant number, since it is smaller than the sum of its proper divisors (29875338).

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

21489462 is an frugal number, since it uses more digits than its factorization.

21489462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 22 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 21489462 is about 4635.6727667082. The cubic root of 21489462 is about 278.0194507033.

Multiplying 21489462 by its sum of digits (36), we get a cube (773620632 = 918³).

It can be divided in two parts, 214 and 89462, that added together give a triangular number (89676 = T₄₂₃).

The spelling of 21489462 in words is "twenty-one million, four hundred eighty-nine thousand, four hundred sixty-two".