212021111001 has 24 divisors (see below), whose sum is σ = 333480763584. Its totient is φ = 119448507360.

The previous prime is 212021110943. The next prime is 212021111023. The reversal of 212021111001 is 100111120212.

It is not a de Polignac number, because 212021111001 - 2¹⁸ = 212020848857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212021111041) 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, 10146750 + ... + 10167623.

It is an arithmetic number, because the mean of its divisors is an integer number (13895031816).

Almost surely, 2^212021111001 is an apocalyptic number.

212021111001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212021111001 is a deficient number, since it is larger than the sum of its proper divisors (121459652583).

212021111001 is a wasteful number, since it uses less digits than its factorization.

212021111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20314461 (or 20314454 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 212021111001 its reverse (100111120212), we get a palindrome (312132231213).

The spelling of 212021111001 in words is "two hundred twelve billion, twenty-one million, one hundred eleven thousand, one".