11215309901 has 4 divisors (see below), whose sum is σ = 11215571904. Its totient is φ = 11215047900.

The previous prime is 11215309891. The next prime is 11215309907. The reversal of 11215309901 is 10990351211.

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-11215309901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11215309907) 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, 50165 + ... + 157946.

It is an arithmetic number, because the mean of its divisors is an integer number (2803892976).

Almost surely, 2^11215309901 is an apocalyptic number.

It is an amenable number.

11215309901 is a deficient number, since it is larger than the sum of its proper divisors (262003).

11215309901 is an equidigital number, since it uses as much as digits as its factorization.

11215309901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262002.

The product of its (nonzero) digits is 2430, while the sum is 32.

The spelling of 11215309901 in words is "eleven billion, two hundred fifteen million, three hundred nine thousand, nine hundred one".