11211720501 has 8 divisors (see below), whose sum is σ = 15352986784. Its totient is φ = 7272467280.

The previous prime is 11211720463. The next prime is 11211720503. The reversal of 11211720501 is 10502711211.

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

It is not a de Polignac number, because 11211720501 - 2¹⁴ = 11211704117 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 (11211720503) 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, 50503135 + ... + 50503356.

It is an arithmetic number, because the mean of its divisors is an integer number (1919123348).

Almost surely, 2^11211720501 is an apocalyptic number.

It is an amenable number.

11211720501 is a deficient number, since it is larger than the sum of its proper divisors (4141266283).

11211720501 is a wasteful number, since it uses less digits than its factorization.

11211720501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101006531.

The product of its (nonzero) digits is 140, while the sum is 21.

The spelling of 11211720501 in words is "eleven billion, two hundred eleven million, seven hundred twenty thousand, five hundred one".