21001212110122 has 8 divisors (see below), whose sum is σ = 31517592742116. Its totient is φ = 10495347862752.

The previous prime is 21001212110041. The next prime is 21001212110129. The reversal of 21001212110122 is 22101121210012.

It can be written as a sum of positive squares in 2 ways, for example, as 20999297085001 + 1915025121 = 4582499^2 + 43761^2 .

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 = 21001212110096 and 21001212110105.

It is not an unprimeable number, because it can be changed into a prime (21001212110129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2629091163 + ... + 2629099150.

Almost surely, 2^{21001212110122} is an apocalyptic number.

21001212110122 is a deficient number, since it is larger than the sum of its proper divisors (10516380631994).

21001212110122 is a wasteful number, since it uses less digits than its factorization.

21001212110122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258192312.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21001212110122 its reverse (22101121210012), we get a palindrome (43102333320134).

The spelling of 21001212110122 in words is "twenty-one trillion, one billion, two hundred twelve million, one hundred ten thousand, one hundred twenty-two".