3420021662556 has 12 divisors (see below), whose sum is σ = 7980050545992. Its totient is φ = 1140007220848.

The previous prime is 3420021662537. The next prime is 3420021662557. The reversal of 3420021662556 is 6552661200243.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420021662557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142500902595 + ... + 142500902618.

It is an arithmetic number, because the mean of its divisors is an integer number (665004212166).

Almost surely, 2^{3420021662556} is an apocalyptic number.

It is an amenable number.

3420021662556 is an abundant number, since it is smaller than the sum of its proper divisors (4560028883436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3420021662556 is a wasteful number, since it uses less digits than its factorization.

3420021662556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285001805220 (or 285001805218 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

Adding to 3420021662556 its reverse (6552661200243), we get a palindrome (9972682862799).

The spelling of 3420021662556 in words is "three trillion, four hundred twenty billion, twenty-one million, six hundred sixty-two thousand, five hundred fifty-six".