105997215021 has 8 divisors (see below), whose sum is σ = 143118602880. Its totient is φ = 69770318592.

The previous prime is 105997215019. The next prime is 105997215073. The reversal of 105997215021 is 120512799501.

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

It is not a de Polignac number, because 105997215021 - 2¹ = 105997215019 is a prime.

It is a super-2 number, since 2×105997215021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105997215011) 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, 223622580 + ... + 223623053.

It is an arithmetic number, because the mean of its divisors is an integer number (17889825360).

Almost surely, 2^105997215021 is an apocalyptic number.

It is an amenable number.

105997215021 is a deficient number, since it is larger than the sum of its proper divisors (37121387859).

105997215021 is an equidigital number, since it uses as much as digits as its factorization.

105997215021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447245715.

The product of its (nonzero) digits is 56700, while the sum is 42.

The spelling of 105997215021 in words is "one hundred five billion, nine hundred ninety-seven million, two hundred fifteen thousand, twenty-one".