3420207021 has 16 divisors (see below), whose sum is σ = 5685539328. Its totient is φ = 1776730800.

The previous prime is 3420206989. The next prime is 3420207071. The reversal of 3420207021 is 1207020243.

It is not a de Polignac number, because 3420207021 - 2⁵ = 3420206989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420207071) 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, 7402815 + ... + 7403276.

It is an arithmetic number, because the mean of its divisors is an integer number (355346208).

Almost surely, 2^3420207021 is an apocalyptic number.

It is an amenable number.

3420207021 is a deficient number, since it is larger than the sum of its proper divisors (2265332307).

3420207021 is a wasteful number, since it uses less digits than its factorization.

3420207021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14806112.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 3420207021 is about 58482.5360342727. The cubic root of 3420207021 is about 1506.6676541215.

Adding to 3420207021 its reverse (1207020243), we get a palindrome (4627227264).

The spelling of 3420207021 in words is "three billion, four hundred twenty million, two hundred seven thousand, twenty-one".