21001021011122 has 8 divisors (see below), whose sum is σ = 31504883841516. Its totient is φ = 10499393063952.

The previous prime is 21001021011041. The next prime is 21001021011161. The reversal of 21001021011122 is 22111012010012.

It can be written as a sum of positive squares in 2 ways, for example, as 20601168400201 + 399852610921 = 4538851^2 + 632339^2 .

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

It is a super-2 number, since 2×21001021011122² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001021011097 and 21001021011106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558697313 + ... + 558734900.

Almost surely, 2^{21001021011122} is an apocalyptic number.

21001021011122 is a deficient number, since it is larger than the sum of its proper divisors (10503862830394).

21001021011122 is a wasteful number, since it uses less digits than its factorization.

21001021011122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117441612.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001021011122 its reverse (22111012010012), we get a palindrome (43112033021134).

The spelling of 21001021011122 in words is "twenty-one trillion, one billion, twenty-one million, eleven thousand, one hundred twenty-two".