211220100011001 has 16 divisors (see below), whose sum is σ = 298195126444800. Its totient is φ = 132529350352128.

The previous prime is 211220100010963. The next prime is 211220100011009. The reversal of 211220100011001 is 100110001022112.

It is not a de Polignac number, because 211220100011001 - 2⁷ = 211220100010873 is a prime.

It is a super-2 number, since 2×211220100011001² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211220100011009) 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, 6643066 + ... + 21600243.

It is an arithmetic number, because the mean of its divisors is an integer number (18637195402800).

Almost surely, 2^{211220100011001} is an apocalyptic number.

It is an amenable number.

211220100011001 is a deficient number, since it is larger than the sum of its proper divisors (86975026433799).

211220100011001 is a wasteful number, since it uses less digits than its factorization.

211220100011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28389968.

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

Adding to 211220100011001 its reverse (100110001022112), we get a palindrome (311330101033113).

The spelling of 211220100011001 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred million, eleven thousand, one".