20021221012011 has 16 divisors (see below), whose sum is σ = 27325236559104. Its totient is φ = 13032558118944.

The previous prime is 20021221011983. The next prime is 20021221012033. The reversal of 20021221012011 is 11021012212002.

It is not a de Polignac number, because 20021221012011 - 2³⁰ = 20020147270187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021221012511) 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, 26507256 + ... + 27252101.

It is an arithmetic number, because the mean of its divisors is an integer number (1707827284944).

Almost surely, 2^{20021221012011} is an apocalyptic number.

20021221012011 is a deficient number, since it is larger than the sum of its proper divisors (7304015547093).

20021221012011 is a wasteful number, since it uses less digits than its factorization.

20021221012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53762290.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20021221012011 its reverse (11021012212002), we get a palindrome (31042233224013).

The spelling of 20021221012011 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, eleven".