21464473 has 2 divisors, whose sum is σ = 21464474. Its totient is φ = 21464472.

The previous prime is 21464467. The next prime is 21464491. The reversal of 21464473 is 37446412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 2350089 = 4372^2 + 1533^2 .

It is a cyclic number.

It is not a de Polignac number, because 21464473 - 2⁹ = 21463961 is a prime.

It is not a weakly prime, because it can be changed into another prime (21464423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732236 + 10732237.

It is an arithmetic number, because the mean of its divisors is an integer number (10732237).

Almost surely, 2^21464473 is an apocalyptic number.

It is an amenable number.

21464473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464473 is an equidigital number, since it uses as much as digits as its factorization.

21464473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 31.

The square root of 21464473 is about 4632.9766889118. The cubic root of 21464473 is about 277.9116440222.

The spelling of 21464473 in words is "twenty-one million, four hundred sixty-four thousand, four hundred seventy-three".