20401333421 has 8 divisors (see below), whose sum is σ = 23316738624. Its totient is φ = 17486160480.

The previous prime is 20401333417. The next prime is 20401333457. The reversal of 20401333421 is 12433310402.

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

It is a cyclic number.

It is not a de Polignac number, because 20401333421 - 2² = 20401333417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401333471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217121 + ... + 296553.

It is an arithmetic number, because the mean of its divisors is an integer number (2914592328).

Almost surely, 2^20401333421 is an apocalyptic number.

It is an amenable number.

20401333421 is a deficient number, since it is larger than the sum of its proper divisors (2915405203).

20401333421 is an equidigital number, since it uses as much as digits as its factorization.

20401333421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116131.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20401333421 its reverse (12433310402), we get a palindrome (32834643823).

The spelling of 20401333421 in words is "twenty billion, four hundred one million, three hundred thirty-three thousand, four hundred twenty-one".