21040144007 has 2 divisors, whose sum is σ = 21040144008. Its totient is φ = 21040144006.

The previous prime is 21040143991. The next prime is 21040144031. The reversal of 21040144007 is 70044104012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21040144007 - 2⁴ = 21040143991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21040144207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520072003 + 10520072004.

It is an arithmetic number, because the mean of its divisors is an integer number (10520072004).

Almost surely, 2^21040144007 is an apocalyptic number.

21040144007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21040144007 is an equidigital number, since it uses as much as digits as its factorization.

21040144007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 23.

Adding to 21040144007 its reverse (70044104012), we get a palindrome (91084248019).

The spelling of 21040144007 in words is "twenty-one billion, forty million, one hundred forty-four thousand, seven".