3420420021 has 8 divisors (see below), whose sum is σ = 5067288960. Its totient is φ = 2280279996.

The previous prime is 3420420001. The next prime is 3420420049. The reversal of 3420420021 is 1200240243.

It is a de Polignac number, because none of the positive numbers 2^k-3420420021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3420419976 and 3420420003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420420001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63341085 + ... + 63341138.

It is an arithmetic number, because the mean of its divisors is an integer number (633411120).

Almost surely, 2^3420420021 is an apocalyptic number.

It is an amenable number.

3420420021 is a deficient number, since it is larger than the sum of its proper divisors (1646868939).

3420420021 is a wasteful number, since it uses less digits than its factorization.

3420420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126682232 (or 126682226 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 3420420021 is about 58484.3570623804. The cubic root of 3420420021 is about 1506.6989303519.

Adding to 3420420021 its reverse (1200240243), we get a palindrome (4620660264).

The spelling of 3420420021 in words is "three billion, four hundred twenty million, four hundred twenty thousand, twenty-one".