21143097 has 6 divisors (see below), whose sum is σ = 30540042. Its totient is φ = 14095392.

The previous prime is 21143081. The next prime is 21143113. The reversal of 21143097 is 79034112.

It is an interprime number because it is at equal distance from previous prime (21143081) and next prime (21143113).

It can be written as a sum of positive squares in only one way, i.e., 21123216 + 19881 = 4596^2 + 141^2 .

It is not a de Polignac number, because 21143097 - 2⁴ = 21143081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21143097.

It is not an unprimeable number, because it can be changed into a prime (21143197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1174608 + ... + 1174625.

It is an arithmetic number, because the mean of its divisors is an integer number (5090007).

Almost surely, 2^21143097 is an apocalyptic number.

It is an amenable number.

21143097 is a deficient number, since it is larger than the sum of its proper divisors (9396945).

21143097 is a wasteful number, since it uses less digits than its factorization.

21143097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349239 (or 2349236 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21143097 is about 4598.1623503308. The cubic root of 21143097 is about 276.5176564082.

The spelling of 21143097 in words is "twenty-one million, one hundred forty-three thousand, ninety-seven".