211220133021 has 24 divisors (see below), whose sum is σ = 312130967616. Its totient is φ = 137601502080.

The previous prime is 211220133013. The next prime is 211220133023. The reversal of 211220133021 is 120331022112.

211220133021 is a `hidden beast` number, since 2 + 112 + 201 + 330 + 21 = 666.

It is not a de Polignac number, because 211220133021 - 2³ = 211220133013 is a prime.

It is a super-2 number, since 2×211220133021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211220132985 and 211220133003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220133023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1390395 + ... + 1534808.

It is an arithmetic number, because the mean of its divisors is an integer number (13005456984).

Almost surely, 2^211220133021 is an apocalyptic number.

It is an amenable number.

211220133021 is a deficient number, since it is larger than the sum of its proper divisors (100910834595).

211220133021 is a wasteful number, since it uses less digits than its factorization.

211220133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925393 (or 2925390 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211220133021 its reverse (120331022112), we get a palindrome (331551155133).

The spelling of 211220133021 in words is "two hundred eleven billion, two hundred twenty million, one hundred thirty-three thousand, twenty-one".