21210101211201 has 32 divisors (see below), whose sum is σ = 34024103976960. Its totient is φ = 11481185016576.

The previous prime is 21210101211199. The next prime is 21210101211289. The reversal of 21210101211201 is 10211210101212.

It is a happy number.

It is not a de Polignac number, because 21210101211201 - 2¹ = 21210101211199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210101219201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2459865 + ... + 6962121.

It is an arithmetic number, because the mean of its divisors is an integer number (1063253249280).

Almost surely, 2^{21210101211201} is an apocalyptic number.

21210101211201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21210101211201 is a deficient number, since it is larger than the sum of its proper divisors (12814002765759).

21210101211201 is a wasteful number, since it uses less digits than its factorization.

21210101211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514093.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210101211201 its reverse (10211210101212), we get a palindrome (31421311312413).

The spelling of 21210101211201 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, two hundred eleven thousand, two hundred one".