212123210001 has 32 divisors (see below), whose sum is σ = 296991636480. Its totient is φ = 134545005504.

The previous prime is 212123209939. The next prime is 212123210029. The reversal of 212123210001 is 100012321212.

It is not a de Polignac number, because 212123210001 - 2⁹ = 212123209489 is a prime.

It is a super-2 number, since 2×212123210001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212123210041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 838740 + ... + 1061946.

It is an arithmetic number, because the mean of its divisors is an integer number (9280988640).

Almost surely, 2^212123210001 is an apocalyptic number.

It is an amenable number.

212123210001 is a deficient number, since it is larger than the sum of its proper divisors (84868426479).

212123210001 is a wasteful number, since it uses less digits than its factorization.

212123210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223445.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 212123210001 its reverse (100012321212), we get a palindrome (312135531213).

The spelling of 212123210001 in words is "two hundred twelve billion, one hundred twenty-three million, two hundred ten thousand, one".