106215231621 has 4 divisors (see below), whose sum is σ = 141620308832. Its totient is φ = 70810154412.

The previous prime is 106215231613. The next prime is 106215231659. The reversal of 106215231621 is 126132512601.

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 not a de Polignac number, because 106215231621 - 2³ = 106215231613 is a prime.

It is a super-2 number, since 2×106215231621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106215231671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17702538601 + ... + 17702538606.

It is an arithmetic number, because the mean of its divisors is an integer number (35405077208).

Almost surely, 2^106215231621 is an apocalyptic number.

It is an amenable number.

106215231621 is a deficient number, since it is larger than the sum of its proper divisors (35405077211).

106215231621 is an equidigital number, since it uses as much as digits as its factorization.

106215231621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35405077210.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 106215231621 in words is "one hundred six billion, two hundred fifteen million, two hundred thirty-one thousand, six hundred twenty-one".