21270851203 has 4 divisors (see below), whose sum is σ = 24309544240. Its totient is φ = 18232158168.

The previous prime is 21270851171. The next prime is 21270851207. The reversal of 21270851203 is 30215807212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21270851203 - 2⁵ = 21270851171 is a prime.

It is a super-2 number, since 2×21270851203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21270851207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519346508 + ... + 1519346521.

It is an arithmetic number, because the mean of its divisors is an integer number (6077386060).

Almost surely, 2^21270851203 is an apocalyptic number.

21270851203 is a deficient number, since it is larger than the sum of its proper divisors (3038693037).

21270851203 is an equidigital number, since it uses as much as digits as its factorization.

21270851203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038693036.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 21270851203 in words is "twenty-one billion, two hundred seventy million, eight hundred fifty-one thousand, two hundred three".