21000012132001 has 16 divisors (see below), whose sum is σ = 24282027020160. Its totient is φ = 17789029977600.

The previous prime is 21000012131971. The next prime is 21000012132019. The reversal of 21000012132001 is 10023121000012.

It is not a de Polignac number, because 21000012132001 - 2²¹ = 21000010034849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000012132061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21583831 + ... + 22535788.

It is an arithmetic number, because the mean of its divisors is an integer number (1517626688760).

Almost surely, 2^{21000012132001} is an apocalyptic number.

It is an amenable number.

21000012132001 is a deficient number, since it is larger than the sum of its proper divisors (3282014888159).

21000012132001 is an equidigital number, since it uses as much as digits as its factorization.

21000012132001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44120424.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21000012132001 its reverse (10023121000012), we get a palindrome (31023133132013).

The spelling of 21000012132001 in words is "twenty-one trillion, twelve million, one hundred thirty-two thousand, one".