3420021662521 has 8 divisors (see below), whose sum is σ = 3430238352840. Its totient is φ = 3409805376768.

The previous prime is 3420021662513. The next prime is 3420021662537. The reversal of 3420021662521 is 1252661200243.

It can be written as a sum of positive squares in 4 ways, for example, as 206875786896 + 3213145875625 = 454836^2 + 1792525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3420021662521 - 2³ = 3420021662513 is a prime.

It is a super-2 number, since 2×3420021662521² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3420021662221) 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 7 ways as a sum of consecutive naturals, for example, 31660815 + ... + 31768651.

It is an arithmetic number, because the mean of its divisors is an integer number (428779794105).

Almost surely, 2^{3420021662521} is an apocalyptic number.

It is an amenable number.

3420021662521 is a deficient number, since it is larger than the sum of its proper divisors (10216690319).

3420021662521 is a wasteful number, since it uses less digits than its factorization.

3420021662521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202283.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 3420021662521 its reverse (1252661200243), we get a palindrome (4672682862764).

The spelling of 3420021662521 in words is "three trillion, four hundred twenty billion, twenty-one million, six hundred sixty-two thousand, five hundred twenty-one".