21141397 has 2 divisors, whose sum is σ = 21141398. Its totient is φ = 21141396.

The previous prime is 21141391. The next prime is 21141403. The reversal of 21141397 is 79314112.

It is a balanced prime because it is at equal distance from previous prime (21141391) and next prime (21141403).

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 7789681 = 3654^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141397 - 2³ = 21141389 is a prime.

It is a super-3 number, since 3×21141397³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570698 + 10570699.

It is an arithmetic number, because the mean of its divisors is an integer number (10570699).

Almost surely, 2^21141397 is an apocalyptic number.

It is an amenable number.

21141397 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141397 is an equidigital number, since it uses as much as digits as its factorization.

21141397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 21141397 is about 4597.9774901580. The cubic root of 21141397 is about 276.5102451222.

The spelling of 21141397 in words is "twenty-one million, one hundred forty-one thousand, three hundred ninety-seven".