211220102011 has 16 divisors (see below), whose sum is σ = 228029644800. Its totient is φ = 194915371648.

The previous prime is 211220101969. The next prime is 211220102029. The reversal of 211220102011 is 110201022112.

It is a cyclic number.

It is not a de Polignac number, because 211220102011 - 2¹⁵ = 211220069243 is a prime.

It is a super-2 number, since 2×211220102011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220101982 and 211220102000.

It is not an unprimeable number, because it can be changed into a prime (211220103011) 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, 109230 + ... + 659068.

It is an arithmetic number, because the mean of its divisors is an integer number (14251852800).

Almost surely, 2^211220102011 is an apocalyptic number.

211220102011 is a deficient number, since it is larger than the sum of its proper divisors (16809542789).

211220102011 is a wasteful number, since it uses less digits than its factorization.

211220102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550298.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211220102011 its reverse (110201022112), we get a palindrome (321421124123).

The spelling of 211220102011 in words is "two hundred eleven billion, two hundred twenty million, one hundred two thousand, eleven".