4020105205251 has 12 divisors (see below), whose sum is σ = 6059289005328. Its totient is φ = 2563545348144.

The previous prime is 4020105205211. The next prime is 4020105205271. The reversal of 4020105205251 is 1525025010204.

4020105205251 is a `hidden beast` number, since 4 + 0 + 201 + 0 + 5 + 205 + 251 = 666.

It is not a de Polignac number, because 4020105205251 - 2⁶ = 4020105205187 is a prime.

It is a super-2 number, since 2×4020105205251² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4020105205211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9710398840 + ... + 9710399253.

It is an arithmetic number, because the mean of its divisors is an integer number (504940750444).

Almost surely, 2^{4020105205251} is an apocalyptic number.

4020105205251 is a deficient number, since it is larger than the sum of its proper divisors (2039183800077).

4020105205251 is a wasteful number, since it uses less digits than its factorization.

4020105205251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19420798122 (or 19420798119 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 4020105205251 in words is "four trillion, twenty billion, one hundred five million, two hundred five thousand, two hundred fifty-one".