21477199 has 2 divisors, whose sum is σ = 21477200. Its totient is φ = 21477198.

The previous prime is 21477179. The next prime is 21477221. The reversal of 21477199 is 99177412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21477199 - 2¹¹ = 21475151 is a prime.

It is a super-2 number, since 2×21477199² = 922540153771202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21477109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738599 + 10738600.

It is an arithmetic number, because the mean of its divisors is an integer number (10738600).

Almost surely, 2^21477199 is an apocalyptic number.

21477199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21477199 is an equidigital number, since it uses as much as digits as its factorization.

21477199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 40.

The square root of 21477199 is about 4634.3499004715. The cubic root of 21477199 is about 277.9665565414.

The spelling of 21477199 in words is "twenty-one million, four hundred seventy-seven thousand, one hundred ninety-nine".