20211221121011 has 8 divisors (see below), whose sum is σ = 20298671923200. Its totient is φ = 20123794361160.

The previous prime is 20211221120999. The next prime is 20211221121041. The reversal of 20211221121011 is 11012112211202.

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 20211221121011 - 2²² = 20211216926707 is a prime.

It is a super-2 number, since 2×20211221121011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211221121041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4324625 + ... + 7689266.

It is an arithmetic number, because the mean of its divisors is an integer number (2537333990400).

Almost surely, 2^{20211221121011} is an apocalyptic number.

20211221121011 is a deficient number, since it is larger than the sum of its proper divisors (87450802189).

20211221121011 is a wasteful number, since it uses less digits than its factorization.

20211221121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12021169.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20211221121011 its reverse (11012112211202), we get a palindrome (31223333332213).

The spelling of 20211221121011 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, eleven".