212021021331 has 36 divisors (see below), whose sum is σ = 356327924472. Its totient is φ = 121129392384.

The previous prime is 212021021297. The next prime is 212021021357. The reversal of 212021021331 is 133120120212.

212021021331 is a `hidden beast` number, since 2 + 120 + 210 + 2 + 1 + 331 = 666.

It is not a de Polignac number, because 212021021331 - 2¹⁷ = 212020890259 is a prime.

It is a super-2 number, since 2×212021021331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212021021431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2158275 + ... + 2254371.

It is an arithmetic number, because the mean of its divisors is an integer number (9897997902).

Almost surely, 2^212021021331 is an apocalyptic number.

212021021331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212021021331 is a deficient number, since it is larger than the sum of its proper divisors (144306903141).

212021021331 is a wasteful number, since it uses less digits than its factorization.

212021021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101120 (or 101110 counting only the distinct ones).

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

Adding to 212021021331 its reverse (133120120212), we get a palindrome (345141141543).

The spelling of 212021021331 in words is "two hundred twelve billion, twenty-one million, twenty-one thousand, three hundred thirty-one".