21000163097 has 4 divisors (see below), whose sum is σ = 21035222400. Its totient is φ = 20965103796.

The previous prime is 21000163073. The next prime is 21000163103. The reversal of 21000163097 is 79036100012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21000163097 - 2⁶ = 21000163033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000163027) 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, 17528753 + ... + 17529950.

It is an arithmetic number, because the mean of its divisors is an integer number (5258805600).

Almost surely, 2^21000163097 is an apocalyptic number.

It is an amenable number.

21000163097 is a deficient number, since it is larger than the sum of its proper divisors (35059303).

21000163097 is an equidigital number, since it uses as much as digits as its factorization.

21000163097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35059302.

The product of its (nonzero) digits is 2268, while the sum is 29.

The spelling of 21000163097 in words is "twenty-one billion, one hundred sixty-three thousand, ninety-seven".