21211102011 has 32 divisors (see below), whose sum is σ = 32990893056. Its totient is φ = 11979200000.

The previous prime is 21211101941. The next prime is 21211102013. The reversal of 21211102011 is 11020111212.

It is a cyclic number.

It is not a de Polignac number, because 21211102011 - 2¹⁴ = 21211085627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211102013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130515 + ... + 243836.

It is an arithmetic number, because the mean of its divisors is an integer number (1030965408).

Almost surely, 2^21211102011 is an apocalyptic number.

21211102011 is a deficient number, since it is larger than the sum of its proper divisors (11779791045).

21211102011 is a wasteful number, since it uses less digits than its factorization.

21211102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374483.

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

Adding to 21211102011 its reverse (11020111212), we get a palindrome (32231213223).

The spelling of 21211102011 in words is "twenty-one billion, two hundred eleven million, one hundred two thousand, eleven".