21270507043 has 2 divisors, whose sum is σ = 21270507044. Its totient is φ = 21270507042.

The previous prime is 21270507017. The next prime is 21270507047. The reversal of 21270507043 is 34070507212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21270507043 - 2²¹ = 21268409891 is a prime.

It is a super-3 number, since 3×21270507043³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21270506996 and 21270507014.

It is not a weakly prime, because it can be changed into another prime (21270507047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10635253521 + 10635253522.

It is an arithmetic number, because the mean of its divisors is an integer number (10635253522).

Almost surely, 2^21270507043 is an apocalyptic number.

21270507043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21270507043 is an equidigital number, since it uses as much as digits as its factorization.

21270507043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 31.

The spelling of 21270507043 in words is "twenty-one billion, two hundred seventy million, five hundred seven thousand, forty-three".