3521402021 has 2 divisors, whose sum is σ = 3521402022. Its totient is φ = 3521402020.

The previous prime is 3521401997. The next prime is 3521402033. The reversal of 3521402021 is 1202041253.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2142393796 + 1379008225 = 46286^2 + 37135^2 .

It is a cyclic number.

It is not a de Polignac number, because 3521402021 - 2²² = 3517207717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3521401984 and 3521402002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3521402081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760701010 + 1760701011.

It is an arithmetic number, because the mean of its divisors is an integer number (1760701011).

Almost surely, 2^3521402021 is an apocalyptic number.

It is an amenable number.

3521402021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3521402021 is an equidigital number, since it uses as much as digits as its factorization.

3521402021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 3521402021 is about 59341.4022500311. The cubic root of 3521402021 is about 1521.3829203454.

Adding to 3521402021 its reverse (1202041253), we get a palindrome (4723443274).

The spelling of 3521402021 in words is "three billion, five hundred twenty-one million, four hundred two thousand, twenty-one".