21934501 has 2 divisors, whose sum is σ = 21934502. Its totient is φ = 21934500.

The previous prime is 21934499. The next prime is 21934537. The reversal of 21934501 is 10543912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16524225 + 5410276 = 4065^2 + 2326^2 .

It is a cyclic number.

It is not a de Polignac number, because 21934501 - 2¹ = 21934499 is a prime.

It is a super-2 number, since 2×21934501² = 962244668238002, which contains 22 as substring.

Together with 21934499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21934201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967250 + 10967251.

It is an arithmetic number, because the mean of its divisors is an integer number (10967251).

Almost surely, 2^21934501 is an apocalyptic number.

It is an amenable number.

21934501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21934501 is an equidigital number, since it uses as much as digits as its factorization.

21934501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21934501 is about 4683.4283383009. The cubic root of 21934501 is about 279.9255797116.

The spelling of 21934501 in words is "twenty-one million, nine hundred thirty-four thousand, five hundred one".