21962471 has 2 divisors, whose sum is σ = 21962472. Its totient is φ = 21962470.

The previous prime is 21962443. The next prime is 21962513. The reversal of 21962471 is 17426912.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21962471 - 2¹⁴ = 21946087 is a prime.

It is a super-3 number, since 3×21962471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21962411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10981235 + 10981236.

It is an arithmetic number, because the mean of its divisors is an integer number (10981236).

Almost surely, 2^21962471 is an apocalyptic number.

21962471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21962471 is an equidigital number, since it uses as much as digits as its factorization.

21962471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 21962471 is about 4686.4134474030. The cubic root of 21962471 is about 280.0445124812.

The spelling of 21962471 in words is "twenty-one million, nine hundred sixty-two thousand, four hundred seventy-one".