11420121421 has 4 divisors (see below), whose sum is σ = 11564680000. Its totient is φ = 11275562844.

The previous prime is 11420121353. The next prime is 11420121473. The reversal of 11420121421 is 12412102411.

It is a happy number.

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 not a de Polignac number, because 11420121421 - 2⁹ = 11420120909 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 (11420121221) 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, 72279171 + ... + 72279328.

It is an arithmetic number, because the mean of its divisors is an integer number (2891170000).

Almost surely, 2^11420121421 is an apocalyptic number.

It is an amenable number.

11420121421 is a deficient number, since it is larger than the sum of its proper divisors (144558579).

11420121421 is an equidigital number, since it uses as much as digits as its factorization.

11420121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144558578.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 11420121421 its reverse (12412102411), we get a palindrome (23832223832).

The spelling of 11420121421 in words is "eleven billion, four hundred twenty million, one hundred twenty-one thousand, four hundred twenty-one".