21022220011121 has 16 divisors (see below), whose sum is σ = 24814801195008. Its totient is φ = 17427665278800.

The previous prime is 21022220011109. The next prime is 21022220011147. The reversal of 21022220011121 is 12111002222012.

It is not a de Polignac number, because 21022220011121 - 2¹⁸ = 21022219748977 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 21022220011121.

It is not an unprimeable number, because it can be changed into a prime (21022220011421) 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, 27738875 + ... + 28486656.

It is an arithmetic number, because the mean of its divisors is an integer number (1550925074688).

Almost surely, 2^{21022220011121} is an apocalyptic number.

It is an amenable number.

21022220011121 is a deficient number, since it is larger than the sum of its proper divisors (3792581183887).

21022220011121 is a wasteful number, since it uses less digits than its factorization.

21022220011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56227292.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21022220011121 its reverse (12111002222012), we get a palindrome (33133222233133).

The spelling of 21022220011121 in words is "twenty-one trillion, twenty-two billion, two hundred twenty million, eleven thousand, one hundred twenty-one".