1370730021 has 4 divisors (see below), whose sum is σ = 1827640032. Its totient is φ = 913820012.

The previous prime is 1370730001. The next prime is 1370730059. The reversal of 1370730021 is 1200370731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1370730021 - 2²¹ = 1368632869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1370729973 and 1370730000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1370730001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228455001 + ... + 228455006.

It is an arithmetic number, because the mean of its divisors is an integer number (456910008).

Almost surely, 2^1370730021 is an apocalyptic number.

It is an amenable number.

1370730021 is a deficient number, since it is larger than the sum of its proper divisors (456910011).

1370730021 is an equidigital number, since it uses as much as digits as its factorization.

1370730021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456910010.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 1370730021 is about 37023.3712808545. The cubic root of 1370730021 is about 1110.8377791769.

The spelling of 1370730021 in words is "one billion, three hundred seventy million, seven hundred thirty thousand, twenty-one".