4021520435605 has 48 divisors (see below), whose sum is σ = 5135213341440. Its totient is φ = 3022783733376.

The previous prime is 4021520435563. The next prime is 4021520435627. The reversal of 4021520435605 is 5065340251204.

It is not a de Polignac number, because 4021520435605 - 2¹³ = 4021520427413 is a prime.

It is a super-2 number, since 2×4021520435605² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 254148724 + ... + 254164546.

It is an arithmetic number, because the mean of its divisors is an integer number (106983611280).

Almost surely, 2^{4021520435605} is an apocalyptic number.

It is an amenable number.

4021520435605 is a deficient number, since it is larger than the sum of its proper divisors (1113692905835).

4021520435605 is a wasteful number, since it uses less digits than its factorization.

4021520435605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17018 (or 16999 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 4021520435605 its reverse (5065340251204), we get a palindrome (9086860686809).

The spelling of 4021520435605 in words is "four trillion, twenty-one billion, five hundred twenty million, four hundred thirty-five thousand, six hundred five".