211021101021 has 16 divisors (see below), whose sum is σ = 290464432128. Its totient is φ = 136130089200.

The previous prime is 211021101001. The next prime is 211021101089. The reversal of 211021101021 is 120101120112.

It is not a de Polignac number, because 211021101021 - 2⁵ = 211021100989 is a prime.

It is a super-2 number, since 2×211021101021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211021100988 and 211021101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211021101001) 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, 967900 + ... + 1165706.

It is an arithmetic number, because the mean of its divisors is an integer number (18154027008).

Almost surely, 2^211021101021 is an apocalyptic number.

It is an amenable number.

211021101021 is a deficient number, since it is larger than the sum of its proper divisors (79443331107).

211021101021 is a wasteful number, since it uses less digits than its factorization.

211021101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209312.

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

Adding to 211021101021 its reverse (120101120112), we get a palindrome (331122221133).

The spelling of 211021101021 in words is "two hundred eleven billion, twenty-one million, one hundred one thousand, twenty-one".