21303203140251 has 8 divisors (see below), whose sum is σ = 31560300948560. Its totient is φ = 14202135426816.

The previous prime is 21303203140231. The next prime is 21303203140277. The reversal of 21303203140251 is 15204130230312.

21303203140251 is a `hidden beast` number, since 2 + 1 + 3 + 0 + 3 + 203 + 1 + 402 + 51 = 666.

It is not a de Polignac number, because 21303203140251 - 2⁷ = 21303203140123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 789007523713 = 21303203140251 / (2 + 1 + 3 + 0 + 3 + 2 + 0 + 3 + 1 + 4 + 0 + 2 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303203140231) 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, 394503761830 + ... + 394503761883.

It is an arithmetic number, because the mean of its divisors is an integer number (3945037618570).

Almost surely, 2^{21303203140251} is an apocalyptic number.

21303203140251 is a deficient number, since it is larger than the sum of its proper divisors (10257097808309).

21303203140251 is an equidigital number, since it uses as much as digits as its factorization.

21303203140251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789007523722 (or 789007523716 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21303203140251 its reverse (15204130230312), we get a palindrome (36507333370563).

The spelling of 21303203140251 in words is "twenty-one trillion, three hundred three billion, two hundred three million, one hundred forty thousand, two hundred fifty-one".