21461747 has 2 divisors, whose sum is σ = 21461748. Its totient is φ = 21461746.

The previous prime is 21461731. The next prime is 21461753. The reversal of 21461747 is 74716412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21461747 - 2⁴ = 21461731 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21461717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730873 + 10730874.

It is an arithmetic number, because the mean of its divisors is an integer number (10730874).

Almost surely, 2^21461747 is an apocalyptic number.

21461747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21461747 is an equidigital number, since it uses as much as digits as its factorization.

21461747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 21461747 is about 4632.6824842633. The cubic root of 21461747 is about 277.8998785464.

The spelling of 21461747 in words is "twenty-one million, four hundred sixty-one thousand, seven hundred forty-seven".