20001011109291 has 32 divisors (see below), whose sum is σ = 30781356963840. Its totient is φ = 12825565300800.

The previous prime is 20001011109269. The next prime is 20001011109329. The reversal of 20001011109291 is 19290111010002.

It is not a de Polignac number, because 20001011109291 - 2⁴¹ = 17801987853739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20001011105291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127159155 + ... + 127316348.

It is an arithmetic number, because the mean of its divisors is an integer number (961917405120).

Almost surely, 2^{20001011109291} is an apocalyptic number.

20001011109291 is a deficient number, since it is larger than the sum of its proper divisors (10780345854549).

20001011109291 is a wasteful number, since it uses less digits than its factorization.

20001011109291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254475624 (or 254475618 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

Adding to 20001011109291 its reverse (19290111010002), we get a palindrome (39291122119293).

The spelling of 20001011109291 in words is "twenty trillion, one billion, eleven million, one hundred nine thousand, two hundred ninety-one".