21401213124122 has 16 divisors (see below), whose sum is σ = 34669125829800. Its totient is φ = 9849501437952.

The previous prime is 21401213124103. The next prime is 21401213124139. The reversal of 21401213124122 is 22142131210412.

It can be written as a sum of positive squares in 4 ways, for example, as 15916900180801 + 5484312943321 = 3989599^2 + 2341861^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 21401213124091 and 21401213124100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1165888247 + ... + 1165906602.

Almost surely, 2^{21401213124122} is an apocalyptic number.

21401213124122 is a deficient number, since it is larger than the sum of its proper divisors (13267912705678).

21401213124122 is a wasteful number, since it uses less digits than its factorization.

21401213124122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331795217.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 21401213124122 its reverse (22142131210412), we get a palindrome (43543344334534).

The spelling of 21401213124122 in words is "twenty-one trillion, four hundred one billion, two hundred thirteen million, one hundred twenty-four thousand, one hundred twenty-two".