211130031021 has 16 divisors (see below), whose sum is σ = 346469794944. Its totient is φ = 111365290944.

The previous prime is 211130030999. The next prime is 211130031083. The reversal of 211130031021 is 120130031112.

It is a happy number.

It is not a de Polignac number, because 211130031021 - 2⁶ = 211130030957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211130031121) 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, 386684766 + ... + 386685311.

It is an arithmetic number, because the mean of its divisors is an integer number (21654362184).

Almost surely, 2^211130031021 is an apocalyptic number.

211130031021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211130031021 is a deficient number, since it is larger than the sum of its proper divisors (135339763923).

211130031021 is a wasteful number, since it uses less digits than its factorization.

211130031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773370100.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 211130031021 its reverse (120130031112), we get a palindrome (331260062133).

Subtracting from 211130031021 its reverse (120130031112), we obtain a palindrome (90999999909).

The spelling of 211130031021 in words is "two hundred eleven billion, one hundred thirty million, thirty-one thousand, twenty-one".