21211000211011 has 16 divisors (see below), whose sum is σ = 23029031087104. Its totient is φ = 19419687874944.

The previous prime is 21211000210987. The next prime is 21211000211099. The reversal of 21211000211011 is 11011200011212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21211000211011 - 2¹⁷ = 21211000079939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211000210982 and 21211000211000.

It is not an unprimeable number, because it can be changed into a prime (21211000271011) 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, 3980101 + ... + 7633033.

It is an arithmetic number, because the mean of its divisors is an integer number (1439314442944).

Almost surely, 2^{21211000211011} is an apocalyptic number.

21211000211011 is a deficient number, since it is larger than the sum of its proper divisors (1818030876093).

21211000211011 is a wasteful number, since it uses less digits than its factorization.

21211000211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656590.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211000211011 its reverse (11011200011212), we get a palindrome (32222200222223).

The spelling of 21211000211011 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven thousand, eleven".