21122121221122 has 4 divisors (see below), whose sum is σ = 31683181831686. Its totient is φ = 10561060610560.

The previous prime is 21122121221057. The next prime is 21122121221143. The reversal of 21122121221122 is 22112212122112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20821324915521 + 300796305601 = 4563039^2 + 548449^2 .

It is a super-2 number, since 2×21122121221122² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21122121221093 and 21122121221102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280530305279 + ... + 5280530305282.

Almost surely, 2^{21122121221122} is an apocalyptic number.

21122121221122 is a deficient number, since it is larger than the sum of its proper divisors (10561060610564).

21122121221122 is a wasteful number, since it uses less digits than its factorization.

21122121221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561060610563.

The product of its digits is 256, while the sum is 22.

Adding to 21122121221122 its reverse (22112212122112), we get a palindrome (43234333343234).

It can be divided in two parts, 2112212122112 and 2, that multiplied together give a palindrome (4224424244224).

The spelling of 21122121221122 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".