211122021 has 16 divisors (see below), whose sum is σ = 309961728. Its totient is φ = 126754800.

The previous prime is 211122013. The next prime is 211122047. The reversal of 211122021 is 120221112.

It is not a de Polignac number, because 211122021 - 2³ = 211122013 is a prime.

It is a super-2 number, since 2×211122021² = 89145015502248882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211121988 and 211122006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122011) 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, 26365 + ... + 33426.

It is an arithmetic number, because the mean of its divisors is an integer number (19372608).

Almost surely, 2^211122021 is an apocalyptic number.

It is an amenable number.

211122021 is a deficient number, since it is larger than the sum of its proper divisors (98839707).

211122021 is a wasteful number, since it uses less digits than its factorization.

211122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59912.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 211122021 is about 14530.0385753101. The cubic root of 211122021 is about 595.4489195026.

Adding to 211122021 its reverse (120221112), we get a palindrome (331343133).

Subtracting from 211122021 its reverse (120221112), we obtain a palindrome (90900909).

The spelling of 211122021 in words is "two hundred eleven million, one hundred twenty-two thousand, twenty-one".