21020120002011 has 32 divisors (see below), whose sum is σ = 33152662448640. Its totient is φ = 11721834203904.

The previous prime is 21020120001943. The next prime is 21020120002019. The reversal of 21020120002011 is 11020002102012.

It is not a de Polignac number, because 21020120002011 - 2²² = 21020115807707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020120002019) 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, 616661946 + ... + 616696031.

It is an arithmetic number, because the mean of its divisors is an integer number (1036020701520).

Almost surely, 2^{21020120002011} is an apocalyptic number.

21020120002011 is a deficient number, since it is larger than the sum of its proper divisors (12132542446629).

21020120002011 is a wasteful number, since it uses less digits than its factorization.

21020120002011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233358035.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020120002011 its reverse (11020002102012), we get a palindrome (32040122104023).

The spelling of 21020120002011 in words is "twenty-one trillion, twenty billion, one hundred twenty million, two thousand, eleven".