11211220401 has 32 divisors (see below), whose sum is σ = 16356556800. Its totient is φ = 6799914240.

The previous prime is 11211220387. The next prime is 11211220411. The reversal of 11211220401 is 10402211211.

It is not a de Polignac number, because 11211220401 - 2⁶ = 11211220337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211220411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1607560 + ... + 1614518.

It is an arithmetic number, because the mean of its divisors is an integer number (511142400).

Almost surely, 2^11211220401 is an apocalyptic number.

It is an amenable number.

11211220401 is a deficient number, since it is larger than the sum of its proper divisors (5145336399).

11211220401 is a wasteful number, since it uses less digits than its factorization.

11211220401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11211220401 its reverse (10402211211), we get a palindrome (21613431612).

The spelling of 11211220401 in words is "eleven billion, two hundred eleven million, two hundred twenty thousand, four hundred one".