140212021 has 2 divisors, whose sum is σ = 140212022. Its totient is φ = 140212020.

The previous prime is 140212019. The next prime is 140212043. The reversal of 140212021 is 120212041.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139594225 + 617796 = 11815^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 140212021 - 2¹ = 140212019 is a prime.

Together with 140212019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 140211992 and 140212010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140215021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70106010 + 70106011.

It is an arithmetic number, because the mean of its divisors is an integer number (70106011).

Almost surely, 2^140212021 is an apocalyptic number.

It is an amenable number.

140212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140212021 is an equidigital number, since it uses as much as digits as its factorization.

140212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 140212021 is about 11841.1156991223. The cubic root of 140212021 is about 519.5114012572.

Adding to 140212021 its reverse (120212041), we get a palindrome (260424062).

The spelling of 140212021 in words is "one hundred forty million, two hundred twelve thousand, twenty-one".