21612231456007 has 2 divisors, whose sum is σ = 21612231456008. Its totient is φ = 21612231456006.

The previous prime is 21612231455981. The next prime is 21612231456031. The reversal of 21612231456007 is 70065413221612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21612231456007 - 2⁷ = 21612231455879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21612231456077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806115728003 + 10806115728004.

It is an arithmetic number, because the mean of its divisors is an integer number (10806115728004).

Almost surely, 2^{21612231456007} is an apocalyptic number.

21612231456007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612231456007 is an equidigital number, since it uses as much as digits as its factorization.

21612231456007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

Adding to 21612231456007 its reverse (70065413221612), we get a palindrome (91677644677619).

The spelling of 21612231456007 in words is "twenty-one trillion, six hundred twelve billion, two hundred thirty-one million, four hundred fifty-six thousand, seven".