20421321401 has 8 divisors (see below), whose sum is σ = 22209938184. Its totient is φ = 18663811200.

The previous prime is 20421321377. The next prime is 20421321407. The reversal of 20421321401 is 10412312402.

It can be written as a sum of positive squares in 4 ways, for example, as 5901312400 + 14520009001 = 76820^2 + 120499^2 .

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 20421321401 - 2⁶ = 20421321337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421321407) 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, 7775276 + ... + 7777901.

It is an arithmetic number, because the mean of its divisors is an integer number (2776242273).

Almost surely, 2^20421321401 is an apocalyptic number.

It is an amenable number.

20421321401 is a deficient number, since it is larger than the sum of its proper divisors (1788616783).

20421321401 is a wasteful number, since it uses less digits than its factorization.

20421321401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15553291.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20421321401 its reverse (10412312402), we get a palindrome (30833633803).

The spelling of 20421321401 in words is "twenty billion, four hundred twenty-one million, three hundred twenty-one thousand, four hundred one".