20021211101211 has 16 divisors (see below), whose sum is σ = 26725458009600. Its totient is φ = 13332220723008.

The previous prime is 20021211101201. The next prime is 20021211101231. The reversal of 20021211101211 is 11210111212002.

It is a happy number.

It is not a de Polignac number, because 20021211101211 - 2¹⁹ = 20021210576923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021211101201) 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, 52764655 + ... + 53142743.

It is an arithmetic number, because the mean of its divisors is an integer number (1670341125600).

Almost surely, 2^{20021211101211} is an apocalyptic number.

20021211101211 is a deficient number, since it is larger than the sum of its proper divisors (6704246908389).

20021211101211 is a wasteful number, since it uses less digits than its factorization.

20021211101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398218.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20021211101211 its reverse (11210111212002), we get a palindrome (31231322313213).

The spelling of 20021211101211 in words is "twenty trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, two hundred eleven".