21210100001211 has 16 divisors (see below), whose sum is σ = 31156510537728. Its totient is φ = 12727332732000.

The previous prime is 21210100001201. The next prime is 21210100001231. The reversal of 21210100001211 is 11210000101212.

It is not a de Polignac number, because 21210100001211 - 2⁶ = 21210100001147 is a prime.

It is a super-2 number, since 2×21210100001211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210100001201) 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, 3181829851 + ... + 3181836516.

It is an arithmetic number, because the mean of its divisors is an integer number (1947281908608).

Almost surely, 2^{21210100001211} is an apocalyptic number.

21210100001211 is a deficient number, since it is larger than the sum of its proper divisors (9946410536517).

21210100001211 is a wasteful number, since it uses less digits than its factorization.

21210100001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363666482.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210100001211 its reverse (11210000101212), we get a palindrome (32420100102423).

The spelling of 21210100001211 in words is "twenty-one trillion, two hundred ten billion, one hundred million, one thousand, two hundred eleven".