21022020122111 has 16 divisors (see below), whose sum is σ = 21600761149440. Its totient is φ = 20443838556960.

The previous prime is 21022020122101. The next prime is 21022020122123. The reversal of 21022020122111 is 11122102022012.

It is a cyclic number.

It is not a de Polignac number, because 21022020122111 - 2³⁴ = 21004840252927 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 21022020122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022020122101) 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, 735767456 + ... + 735796026.

It is an arithmetic number, because the mean of its divisors is an integer number (1350047571840).

Almost surely, 2^{21022020122111} is an apocalyptic number.

21022020122111 is a deficient number, since it is larger than the sum of its proper divisors (578741027329).

21022020122111 is a wasteful number, since it uses less digits than its factorization.

21022020122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37654.

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

Adding to 21022020122111 its reverse (11122102022012), we get a palindrome (32144122144123).

The spelling of 21022020122111 in words is "twenty-one trillion, twenty-two billion, twenty million, one hundred twenty-two thousand, one hundred eleven".