1333870721 has 4 divisors (see below), whose sum is σ = 1333945392. Its totient is φ = 1333796052.

The previous prime is 1333870691. The next prime is 1333870723. The reversal of 1333870721 is 1270783331.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1333870721 - 2¹⁴ = 1333854337 is a prime.

It is a super-2 number, since 2×1333870721² = 3558422200682119682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1333870723) 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, 7046 + ... + 52128.

It is an arithmetic number, because the mean of its divisors is an integer number (333486348).

Almost surely, 2^1333870721 is an apocalyptic number.

It is an amenable number.

1333870721 is a deficient number, since it is larger than the sum of its proper divisors (74671).

1333870721 is an equidigital number, since it uses as much as digits as its factorization.

1333870721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74670.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1333870721 is about 36522.1949093972. The cubic root of 1333870721 is about 1100.7902643520.

The spelling of 1333870721 in words is "one billion, three hundred thirty-three million, eight hundred seventy thousand, seven hundred twenty-one".