68211837703021 has 4 divisors (see below), whose sum is σ = 69798159510112. Its totient is φ = 66625515895932.

The previous prime is 68211837703007. The next prime is 68211837703027. The reversal of 68211837703021 is 12030773811286.

It is a happy number.

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 68211837703021 - 2⁷ = 68211837702893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68211837703027) 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, 793160903481 + ... + 793160903566.

It is an arithmetic number, because the mean of its divisors is an integer number (17449539877528).

Almost surely, 2^{68211837703021} is an apocalyptic number.

It is an amenable number.

68211837703021 is a deficient number, since it is larger than the sum of its proper divisors (1586321807091).

68211837703021 is a wasteful number, since it uses less digits than its factorization.

68211837703021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586321807090.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 68211837703021 in words is "sixty-eight trillion, two hundred eleven billion, eight hundred thirty-seven million, seven hundred three thousand, twenty-one".