211434031021 has 16 divisors (see below), whose sum is σ = 214435444608. Its totient is φ = 208458936000.

The previous prime is 211434031019. The next prime is 211434031033. The reversal of 211434031021 is 120130434112.

It is a cyclic number.

It is not a de Polignac number, because 211434031021 - 2¹ = 211434031019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211434030983 and 211434031001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211434031121) 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, 12515046 + ... + 12531928.

It is an arithmetic number, because the mean of its divisors is an integer number (13402215288).

Almost surely, 2^211434031021 is an apocalyptic number.

It is an amenable number.

211434031021 is a deficient number, since it is larger than the sum of its proper divisors (3001413587).

211434031021 is a wasteful number, since it uses less digits than its factorization.

211434031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17652.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 211434031021 its reverse (120130434112), we get a palindrome (331564465133).

The spelling of 211434031021 in words is "two hundred eleven billion, four hundred thirty-four million, thirty-one thousand, twenty-one".