340999921 has 2 divisors, whose sum is σ = 340999922. Its totient is φ = 340999920.

The previous prime is 340999913. The next prime is 340999949. The reversal of 340999921 is 129999043.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194323600 + 146676321 = 13940^2 + 12111^2 .

It is a cyclic number.

It is not a de Polignac number, because 340999921 - 2³ = 340999913 is a prime.

It is a super-2 number, since 2×340999921² = 232561892244012482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (340999961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170499960 + 170499961.

It is an arithmetic number, because the mean of its divisors is an integer number (170499961).

Almost surely, 2^340999921 is an apocalyptic number.

It is an amenable number.

340999921 is a deficient number, since it is larger than the sum of its proper divisors (1).

340999921 is an equidigital number, since it uses as much as digits as its factorization.

340999921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 340999921 is about 18466.1831735743. The cubic root of 340999921 is about 698.6367488304.

The spelling of 340999921 in words is "three hundred forty million, nine hundred ninety-nine thousand, nine hundred twenty-one".