20211011 has 8 divisors (see below), whose sum is σ = 21480624. Its totient is φ = 18950400.

The previous prime is 20211007. The next prime is 20211031. The reversal of 20211011 is 11011202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20211011 - 2² = 20211007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211011.

It is not an unprimeable number, because it can be changed into a prime (20211001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (2685078).

Almost surely, 2^20211011 is an apocalyptic number.

20211011 is a deficient number, since it is larger than the sum of its proper divisors (1269613).

20211011 is a wasteful number, since it uses less digits than its factorization.

20211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20211011 is about 4495.6658016361. The cubic root of 20211011 is about 272.3930439047.

Adding to 20211011 its reverse (11011202), we get a palindrome (31222213).

It can be divided in two parts, 2021 and 1011, that multiplied together give a triangular number (2043231 = T₂₀₂₁).

The spelling of 20211011 in words is "twenty million, two hundred eleven thousand, eleven".