3387661978421 has 16 divisors (see below), whose sum is σ = 3919494069120. Its totient is φ = 2867921925120.

The previous prime is 3387661978403. The next prime is 3387661978423. The reversal of 3387661978421 is 1248791667833.

It is a de Polignac number, because none of the positive numbers 2^k-3387661978421 is a prime.

It is a super-2 number, since 2×3387661978421² (a number of 26 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3387661978423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4747256 + ... + 5414033.

It is an arithmetic number, because the mean of its divisors is an integer number (244968379320).

Almost surely, 2^{3387661978421} is an apocalyptic number.

It is an amenable number.

3387661978421 is a deficient number, since it is larger than the sum of its proper divisors (531832090699).

3387661978421 is a wasteful number, since it uses less digits than its factorization.

3387661978421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161884.

The product of its digits is 73156608, while the sum is 65.

The spelling of 3387661978421 in words is "three trillion, three hundred eighty-seven billion, six hundred sixty-one million, nine hundred seventy-eight thousand, four hundred twenty-one".