21030097 has 16 divisors (see below), whose sum is σ = 23781312. Its totient is φ = 18429120.

The previous prime is 21030083. The next prime is 21030109. The reversal of 21030097 is 79003012.

It is a cyclic number.

It is not a de Polignac number, because 21030097 - 2¹⁹ = 20505809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21030047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66183 + ... + 66499.

It is an arithmetic number, because the mean of its divisors is an integer number (1486332).

Almost surely, 2^21030097 is an apocalyptic number.

It is an amenable number.

21030097 is a deficient number, since it is larger than the sum of its proper divisors (2751215).

21030097 is a wasteful number, since it uses less digits than its factorization.

21030097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 21030097 is about 4585.8583711231. The cubic root of 21030097 is about 276.0241568508.

The spelling of 21030097 in words is "twenty-one million, thirty thousand, ninety-seven".