21941069 has 4 divisors (see below), whose sum is σ = 21960540. Its totient is φ = 21921600.

The previous prime is 21941053. The next prime is 21941113. The reversal of 21941069 is 96014912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5579044 + 16362025 = 2362^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 21941069 - 2⁴ = 21941053 is a prime.

It is a super-2 number, since 2×21941069² = 962821017725522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7934 + ... + 10335.

It is an arithmetic number, because the mean of its divisors is an integer number (5490135).

Almost surely, 2^21941069 is an apocalyptic number.

It is an amenable number.

21941069 is a deficient number, since it is larger than the sum of its proper divisors (19471).

21941069 is a wasteful number, since it uses less digits than its factorization.

21941069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19470.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21941069 is about 4684.1294815579. The cubic root of 21941069 is about 279.9535169436.

The spelling of 21941069 in words is "twenty-one million, nine hundred forty-one thousand, sixty-nine".