1380212021 has 2 divisors, whose sum is σ = 1380212022. Its totient is φ = 1380212020.

The previous prime is 1380212017. The next prime is 1380212059. The reversal of 1380212021 is 1202120831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1340584996 + 39627025 = 36614^2 + 6295^2 .

It is an emirp because it is prime and its reverse (1202120831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1380212021 - 2² = 1380212017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1380211984 and 1380212002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380212521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690106010 + 690106011.

It is an arithmetic number, because the mean of its divisors is an integer number (690106011).

Almost surely, 2^1380212021 is an apocalyptic number.

It is an amenable number.

1380212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380212021 is an equidigital number, since it uses as much as digits as its factorization.

1380212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1380212021 is about 37151.2048391435. The cubic root of 1380212021 is about 1113.3932956717.

Adding to 1380212021 its reverse (1202120831), we get a palindrome (2582332852).

The spelling of 1380212021 in words is "one billion, three hundred eighty million, two hundred twelve thousand, twenty-one".