370000021 has 2 divisors, whose sum is σ = 370000022. Its totient is φ = 370000020.

The previous prime is 370000003. The next prime is 370000093. The reversal of 370000021 is 120000073.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367143921 + 2856100 = 19161^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 370000021 - 2¹³ = 369991829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 369999956 and 370000010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (370000321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 185000010 + 185000011.

It is an arithmetic number, because the mean of its divisors is an integer number (185000011).

Almost surely, 2^370000021 is an apocalyptic number.

It is an amenable number.

370000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

370000021 is an equidigital number, since it uses as much as digits as its factorization.

370000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 370000021 is about 19235.3846075403. The cubic root of 370000021 is about 717.9054487888.

Adding to 370000021 its reverse (120000073), we get a palindrome (490000094).

The spelling of 370000021 in words is "three hundred seventy million, twenty-one", and thus it is an aban number.