211221001011 has 16 divisors (see below), whose sum is σ = 289491038208. Its totient is φ = 136889100000.

The previous prime is 211221001001. The next prime is 211221001031. The reversal of 211221001011 is 110100122112.

It is not a de Polignac number, because 211221001011 - 2²¹ = 211218903859 is a prime.

It is a super-2 number, since 2×211221001011² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221001001) 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, 698865 + ... + 954386.

It is an arithmetic number, because the mean of its divisors is an integer number (18093189888).

Almost surely, 2^211221001011 is an apocalyptic number.

211221001011 is a deficient number, since it is larger than the sum of its proper divisors (78270037197).

211221001011 is a wasteful number, since it uses less digits than its factorization.

211221001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654442.

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

Adding to 211221001011 its reverse (110100122112), we get a palindrome (321321123123).

The spelling of 211221001011 in words is "two hundred eleven billion, two hundred twenty-one million, one thousand, eleven".