21213543315097 has 8 divisors (see below), whose sum is σ = 24306373540800. Its totient is φ = 18136294098864.

The previous prime is 21213543315073. The next prime is 21213543315143. The reversal of 21213543315097 is 79051334531212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213543315097 - 2¹⁹ = 21213542790809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213543315997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3895249447 + ... + 3895254892.

It is an arithmetic number, because the mean of its divisors is an integer number (3038296692600).

Almost surely, 2^{21213543315097} is an apocalyptic number.

It is an amenable number.

21213543315097 is a deficient number, since it is larger than the sum of its proper divisors (3092830225703).

21213543315097 is an equidigital number, since it uses as much as digits as its factorization.

21213543315097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790504735.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 21213543315097 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-three million, three hundred fifteen thousand, ninety-seven".