21010002021122 has 8 divisors (see below), whose sum is σ = 32109625730556. Its totient is φ = 10306793444272.

The previous prime is 21010002021119. The next prime is 21010002021209. The reversal of 21010002021122 is 22112020001012.

It can be written as a sum of positive squares in 2 ways, for example, as 19679506673281 + 1330495347841 = 4436159^2 + 1153471^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21010002021097 and 21010002021106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99103783013 + ... + 99103783224.

Almost surely, 2^{21010002021122} is an apocalyptic number.

21010002021122 is a deficient number, since it is larger than the sum of its proper divisors (11099623709434).

21010002021122 is a wasteful number, since it uses less digits than its factorization.

21010002021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198207566292.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21010002021122 its reverse (22112020001012), we get a palindrome (43122022022134).

The spelling of 21010002021122 in words is "twenty-one trillion, ten billion, two million, twenty-one thousand, one hundred twenty-two".