391000121002 has 16 divisors (see below), whose sum is σ = 587919574080. Its totient is φ = 195027309792.

The previous prime is 391000120963. The next prime is 391000121009. The reversal of 391000121002 is 200121000193.

It is not an unprimeable number, because it can be changed into a prime (391000121009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1990899 + ... + 2178457.

It is an arithmetic number, because the mean of its divisors is an integer number (36744973380).

Almost surely, 2^391000121002 is an apocalyptic number.

391000121002 is a deficient number, since it is larger than the sum of its proper divisors (196919453078).

391000121002 is a wasteful number, since it uses less digits than its factorization.

391000121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190077.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 391000121002 its reverse (200121000193), we get a palindrome (591121121195).

The spelling of 391000121002 in words is "three hundred ninety-one billion, one hundred twenty-one thousand, two".