103212091 has 4 divisors (see below), whose sum is σ = 103260784. Its totient is φ = 103163400.

The previous prime is 103212071. The next prime is 103212103. The reversal of 103212091 is 190212301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190212301 = 37 ⋅5140873.

It is a cyclic number.

It is not a de Polignac number, because 103212091 - 2⁵ = 103212059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (103212071) 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, 21015 + ... + 25456.

It is an arithmetic number, because the mean of its divisors is an integer number (25815196).

Almost surely, 2^103212091 is an apocalyptic number.

103212091 is a deficient number, since it is larger than the sum of its proper divisors (48693).

103212091 is an equidigital number, since it uses as much as digits as its factorization.

103212091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48692.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 103212091 is about 10159.3351652556. The cubic root of 103212091 is about 469.0763374725.

Adding to 103212091 its reverse (190212301), we get a palindrome (293424392).

The spelling of 103212091 in words is "one hundred three million, two hundred twelve thousand, ninety-one".