20421200351 has 8 divisors (see below), whose sum is σ = 20860014240. Its totient is φ = 19984368352.

The previous prime is 20421200347. The next prime is 20421200407. The reversal of 20421200351 is 15300212402.

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 20421200351 - 2² = 20421200347 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 (20421200651) 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, 474635 + ... + 515868.

It is an arithmetic number, because the mean of its divisors is an integer number (2607501780).

Almost surely, 2^20421200351 is an apocalyptic number.

20421200351 is a deficient number, since it is larger than the sum of its proper divisors (438813889).

20421200351 is an equidigital number, since it uses as much as digits as its factorization.

20421200351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990945.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20421200351 its reverse (15300212402), we get a palindrome (35721412753).

The spelling of 20421200351 in words is "twenty billion, four hundred twenty-one million, two hundred thousand, three hundred fifty-one".