21463406 has 4 divisors (see below), whose sum is σ = 32195112. Its totient is φ = 10731702.

The previous prime is 21463373. The next prime is 21463417. The reversal of 21463406 is 60436412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5365850 + ... + 5365853.

It is an arithmetic number, because the mean of its divisors is an integer number (8048778).

Almost surely, 2^21463406 is an apocalyptic number.

21463406 is a deficient number, since it is larger than the sum of its proper divisors (10731706).

21463406 is a wasteful number, since it uses less digits than its factorization.

21463406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10731705.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 21463406 is about 4632.8615347321. The cubic root of 21463406 is about 277.9070389454.

Adding to 21463406 its reverse (60436412), we get a palindrome (81899818).

The spelling of 21463406 in words is "twenty-one million, four hundred sixty-three thousand, four hundred six".