1020405515211 has 24 divisors (see below), whose sum is σ = 1492823354880. Its totient is φ = 671548144176.

The previous prime is 1020405515201. The next prime is 1020405515219. The reversal of 1020405515211 is 1125155040201.

It is a happy number.

1020405515211 is a `hidden beast` number, since 1 + 0 + 20 + 40 + 551 + 52 + 1 + 1 = 666.

It is not a de Polignac number, because 1020405515211 - 2⁵ = 1020405515179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020405515219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4294650 + ... + 4526016.

It is an arithmetic number, because the mean of its divisors is an integer number (62200973120).

Almost surely, 2^{1020405515211} is an apocalyptic number.

1020405515211 is a deficient number, since it is larger than the sum of its proper divisors (472417839669).

1020405515211 is a wasteful number, since it uses less digits than its factorization.

1020405515211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237655 (or 237652 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 1020405515211 in words is "one trillion, twenty billion, four hundred five million, five hundred fifteen thousand, two hundred eleven".