21453046 has 16 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 10552104.

The previous prime is 21453037. The next prime is 21453059. The reversal of 21453046 is 64035412.

It is a self number, because there is not a number n which added to its sum of digits gives 21453046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45705 + ... + 46171.

It is an arithmetic number, because the mean of its divisors is an integer number (2044224).

Almost surely, 2^21453046 is an apocalyptic number.

21453046 is a deficient number, since it is larger than the sum of its proper divisors (11254538).

21453046 is a wasteful number, since it uses less digits than its factorization.

21453046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21453046 is about 4631.7433003136. The cubic root of 21453046 is about 277.8623181731.

Adding to 21453046 its reverse (64035412), we get a palindrome (85488458).

It can be divided in two parts, 2 and 1453046, that multiplied together give a palindrome (2906092).

The spelling of 21453046 in words is "twenty-one million, four hundred fifty-three thousand, forty-six".