20421143315 has 16 divisors (see below), whose sum is σ = 24829754880. Its totient is φ = 16120896480.

The previous prime is 20421143273. The next prime is 20421143321. The reversal of 20421143315 is 51334112402.

It is a happy number.

It is not a de Polignac number, because 20421143315 - 2⁶ = 20421143251 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723620 + ... + 751310.

It is an arithmetic number, because the mean of its divisors is an integer number (1551859680).

Almost surely, 2^20421143315 is an apocalyptic number.

20421143315 is a deficient number, since it is larger than the sum of its proper divisors (4408611565).

20421143315 is a wasteful number, since it uses less digits than its factorization.

20421143315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29642.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20421143315 its reverse (51334112402), we get a palindrome (71755255717).

The spelling of 20421143315 in words is "twenty billion, four hundred twenty-one million, one hundred forty-three thousand, three hundred fifteen".