212140420121 has 48 divisors (see below), whose sum is σ = 259106335488. Its totient is φ = 172850832000.

The previous prime is 212140420117. The next prime is 212140420123. The reversal of 212140420121 is 121024041212.

It is not a de Polignac number, because 212140420121 - 2² = 212140420117 is a prime.

It is a super-2 number, since 2×212140420121² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212140420093 and 212140420102.

It is not an unprimeable number, because it can be changed into a prime (212140420123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207776591 + ... + 207777611.

It is an arithmetic number, because the mean of its divisors is an integer number (5398048656).

Almost surely, 2^212140420121 is an apocalyptic number.

It is an amenable number.

212140420121 is a deficient number, since it is larger than the sum of its proper divisors (46965915367).

212140420121 is a wasteful number, since it uses less digits than its factorization.

212140420121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2015 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 212140420121 its reverse (121024041212), we get a palindrome (333164461333).

The spelling of 212140420121 in words is "two hundred twelve billion, one hundred forty million, four hundred twenty thousand, one hundred twenty-one".