21022012121123 has 12 divisors (see below), whose sum is σ = 22795953577488. Its totient is φ = 19377252367200.

The previous prime is 21022012121101. The next prime is 21022012121129. The reversal of 21022012121123 is 32112121022012.

It is not a de Polignac number, because 21022012121123 - 2⁶ = 21022012121059 is a prime.

It is a super-2 number, since 2×21022012121123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21022012121095 and 21022012121104.

It is not an unprimeable number, because it can be changed into a prime (21022012121129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88605215 + ... + 88842152.

It is an arithmetic number, because the mean of its divisors is an integer number (1899662798124).

Almost surely, 2^{21022012121123} is an apocalyptic number.

21022012121123 is a deficient number, since it is larger than the sum of its proper divisors (1773941456365).

21022012121123 is a wasteful number, since it uses less digits than its factorization.

21022012121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177448094 (or 177448081 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21022012121123 its reverse (32112121022012), we get a palindrome (53134133143135).

The spelling of 21022012121123 in words is "twenty-one trillion, twenty-two billion, twelve million, one hundred twenty-one thousand, one hundred twenty-three".