21298141 has 2 divisors, whose sum is σ = 21298142. Its totient is φ = 21298140.

The previous prime is 21298117. The next prime is 21298153. The reversal of 21298141 is 14189212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20666116 + 632025 = 4546^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21298141 - 2¹³ = 21289949 is a prime.

It is a super-2 number, since 2×21298141² = 907221620111762, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21298171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10649070 + 10649071.

It is an arithmetic number, because the mean of its divisors is an integer number (10649071).

Almost surely, 2^21298141 is an apocalyptic number.

It is an amenable number.

21298141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21298141 is an equidigital number, since it uses as much as digits as its factorization.

21298141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

The square root of 21298141 is about 4614.9908992326. The cubic root of 21298141 is about 277.1919195463.

The spelling of 21298141 in words is "twenty-one million, two hundred ninety-eight thousand, one hundred forty-one".