21000031210101 has 16 divisors (see below), whose sum is σ = 28597208580864. Its totient is φ = 13701466935744.

The previous prime is 21000031210087. The next prime is 21000031210111. The reversal of 21000031210101 is 10101213000012.

It is not a de Polignac number, because 21000031210101 - 2¹⁸ = 21000030947957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000031210111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 847086 + ... + 6535871.

It is an arithmetic number, because the mean of its divisors is an integer number (1787325536304).

Almost surely, 2^{21000031210101} is an apocalyptic number.

It is an amenable number.

21000031210101 is a deficient number, since it is larger than the sum of its proper divisors (7597177370763).

21000031210101 is a wasteful number, since it uses less digits than its factorization.

21000031210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7403180.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21000031210101 its reverse (10101213000012), we get a palindrome (31101244210113).

The spelling of 21000031210101 in words is "twenty-one trillion, thirty-one million, two hundred ten thousand, one hundred one".