2685498820421 has 2 divisors, whose sum is σ = 2685498820422. Its totient is φ = 2685498820420.

The previous prime is 2685498820357. The next prime is 2685498820441. The reversal of 2685498820421 is 1240288945862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1649400804100 + 1036098016321 = 1284290^2 + 1017889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685498820421 - 2⁶ = 2685498820357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2685498820441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342749410210 + 1342749410211.

It is an arithmetic number, because the mean of its divisors is an integer number (1342749410211).

Almost surely, 2^{2685498820421} is an apocalyptic number.

It is an amenable number.

2685498820421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685498820421 is an equidigital number, since it uses as much as digits as its factorization.

2685498820421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17694720, while the sum is 59.

The spelling of 2685498820421 in words is "two trillion, six hundred eighty-five billion, four hundred ninety-eight million, eight hundred twenty thousand, four hundred twenty-one".