21461313073001 has 4 divisors (see below), whose sum is σ = 21461323104852. Its totient is φ = 21461303041152.

The previous prime is 21461313072977. The next prime is 21461313073037. The reversal of 21461313073001 is 10037031316412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18041901875776 + 3419411197225 = 4247576^2 + 1849165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21461313073001 - 2¹⁸ = 21461312810857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461313073201) 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, 376640 + ... + 6562353.

It is an arithmetic number, because the mean of its divisors is an integer number (5365330776213).

Almost surely, 2^{21461313073001} is an apocalyptic number.

It is an amenable number.

21461313073001 is a deficient number, since it is larger than the sum of its proper divisors (10031851).

21461313073001 is an equidigital number, since it uses as much as digits as its factorization.

21461313073001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10031850.

The product of its (nonzero) digits is 9072, while the sum is 32.

Adding to 21461313073001 its reverse (10037031316412), we get a palindrome (31498344389413).

The spelling of 21461313073001 in words is "twenty-one trillion, four hundred sixty-one billion, three hundred thirteen million, seventy-three thousand, one".