21400202443 has 2 divisors, whose sum is σ = 21400202444. Its totient is φ = 21400202442.

The previous prime is 21400202431. The next prime is 21400202471. The reversal of 21400202443 is 34420200412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21400202443 - 2⁹ = 21400201931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21400202423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700101221 + 10700101222.

It is an arithmetic number, because the mean of its divisors is an integer number (10700101222).

Almost surely, 2^21400202443 is an apocalyptic number.

21400202443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400202443 is an equidigital number, since it uses as much as digits as its factorization.

21400202443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21400202443 its reverse (34420200412), we get a palindrome (55820402855).

The spelling of 21400202443 in words is "twenty-one billion, four hundred million, two hundred two thousand, four hundred forty-three".