21001312223097 has 16 divisors (see below), whose sum is σ = 30937994478720. Its totient is φ = 12604368119552.

The previous prime is 21001312223093. The next prime is 21001312223107. The reversal of 21001312223097 is 79032221310012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21001312223097 - 2² = 21001312223093 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001312223093) 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, 8951964822 + ... + 8951967167.

It is an arithmetic number, because the mean of its divisors is an integer number (1933624654920).

Almost surely, 2^{21001312223097} is an apocalyptic number.

It is an amenable number.

21001312223097 is a deficient number, since it is larger than the sum of its proper divisors (9936682255623).

21001312223097 is a wasteful number, since it uses less digits than its factorization.

21001312223097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17903932032.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 21001312223097 in words is "twenty-one trillion, one billion, three hundred twelve million, two hundred twenty-three thousand, ninety-seven".