20100012021011 has 4 divisors (see below), whose sum is σ = 21646166791872. Its totient is φ = 18553857250152.

The previous prime is 20100012020993. The next prime is 20100012021121. The reversal of 20100012021011 is 11012021000102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100012021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100012020983 and 20100012021001.

It is not an unprimeable number, because it can be changed into a prime (20100012021911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773077385411 + ... + 773077385436.

It is an arithmetic number, because the mean of its divisors is an integer number (5411541697968).

Almost surely, 2^{20100012021011} is an apocalyptic number.

20100012021011 is a deficient number, since it is larger than the sum of its proper divisors (1546154770861).

20100012021011 is a wasteful number, since it uses less digits than its factorization.

20100012021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546154770860.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20100012021011 its reverse (11012021000102), we get a palindrome (31112033021113).

The spelling of 20100012021011 in words is "twenty trillion, one hundred billion, twelve million, twenty-one thousand, eleven".