11401220421 has 32 divisors (see below), whose sum is σ = 17053670400. Its totient is φ = 7527783600.

The previous prime is 11401220417. The next prime is 11401220429. The reversal of 11401220421 is 12402210411.

11401220421 is a `hidden beast` number, since 1 + 1 + 401 + 220 + 42 + 1 = 666.

It is not a de Polignac number, because 11401220421 - 2² = 11401220417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11401220394 and 11401220403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11401220429) 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, 1410690 + ... + 1418748.

It is an arithmetic number, because the mean of its divisors is an integer number (532927200).

Almost surely, 2^11401220421 is an apocalyptic number.

It is an amenable number.

11401220421 is a deficient number, since it is larger than the sum of its proper divisors (5652449979).

11401220421 is a wasteful number, since it uses less digits than its factorization.

11401220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566 (or 8560 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 11401220421 its reverse (12402210411), we get a palindrome (23803430832).

The spelling of 11401220421 in words is "eleven billion, four hundred one million, two hundred twenty thousand, four hundred twenty-one".