21012001221122 has 4 divisors (see below), whose sum is σ = 31518001831686. Its totient is φ = 10506000610560.

The previous prime is 21012001221121. The next prime is 21012001221187. The reversal of 21012001221122 is 22112210021012.

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., 18307196673481 + 2704804547641 = 4278691^2 + 1644629^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21012001221122.

It is not an unprimeable number, because it can be changed into a prime (21012001221121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253000305279 + ... + 5253000305282.

Almost surely, 2^{21012001221122} is an apocalyptic number.

21012001221122 is a deficient number, since it is larger than the sum of its proper divisors (10506000610564).

21012001221122 is a wasteful number, since it uses less digits than its factorization.

21012001221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506000610563.

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

Adding to 21012001221122 its reverse (22112210021012), we get a palindrome (43124211242134).

The spelling of 21012001221122 in words is "twenty-one trillion, twelve billion, one million, two hundred twenty-one thousand, one hundred twenty-two".