106213121 has 4 divisors (see below), whose sum is σ = 121386432. Its totient is φ = 91039812.

The previous prime is 106213087. The next prime is 106213123. The reversal of 106213121 is 121312601.

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 a de Polignac number, because none of the positive numbers 2^k-106213121 is a prime.

It is a super-2 number, since 2×106213121² = 22562454145121282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 106213121.

It is not an unprimeable number, because it can be changed into a prime (106213123) 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, 7586645 + ... + 7586658.

It is an arithmetic number, because the mean of its divisors is an integer number (30346608).

Almost surely, 2^106213121 is an apocalyptic number.

It is an amenable number.

106213121 is a deficient number, since it is larger than the sum of its proper divisors (15173311).

106213121 is an equidigital number, since it uses as much as digits as its factorization.

106213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15173310.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 106213121 is about 10305.9750145243. The cubic root of 106213121 is about 473.5793133413.

Adding to 106213121 its reverse (121312601), we get a palindrome (227525722).

The spelling of 106213121 in words is "one hundred six million, two hundred thirteen thousand, one hundred twenty-one".