20211220011 has 16 divisors (see below), whose sum is σ = 27217209344. Its totient is φ = 13339759104.

The previous prime is 20211219929. The next prime is 20211220013. The reversal of 20211220011 is 11002211202.

It is not a de Polignac number, because 20211220011 - 2⁷ = 20211219883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211220013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1664715 + ... + 1676811.

It is an arithmetic number, because the mean of its divisors is an integer number (1701075584).

Almost surely, 2^20211220011 is an apocalyptic number.

20211220011 is a deficient number, since it is larger than the sum of its proper divisors (7005989333).

20211220011 is a wasteful number, since it uses less digits than its factorization.

20211220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17610.

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

Adding to 20211220011 its reverse (11002211202), we get a palindrome (31213431213).

The spelling of 20211220011 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand, eleven".