20400312021 has 8 divisors (see below), whose sum is σ = 27506039040. Its totient is φ = 13447396512.

The previous prime is 20400311983. The next prime is 20400312041. The reversal of 20400312021 is 12021300402.

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

It is not a de Polignac number, because 20400312021 - 2¹⁵ = 20400279253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400312041) 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, 38202565 + ... + 38203098.

It is an arithmetic number, because the mean of its divisors is an integer number (3438254880).

Almost surely, 2^20400312021 is an apocalyptic number.

It is an amenable number.

20400312021 is a deficient number, since it is larger than the sum of its proper divisors (7105727019).

20400312021 is an equidigital number, since it uses as much as digits as its factorization.

20400312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76405755.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20400312021 its reverse (12021300402), we get a palindrome (32421612423).

The spelling of 20400312021 in words is "twenty billion, four hundred million, three hundred twelve thousand, twenty-one".