21010021001012 has 24 divisors (see below), whose sum is σ = 36797984714400. Its totient is φ = 10496311884576.

The previous prime is 21010021000993. The next prime is 21010021001017. The reversal of 21010021001012 is 21010012001012.

It is a junction number, because it is equal to n+sod(n) for n = 21010021000984 and 21010021001002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010021001017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119328539 + ... + 119504477.

It is an arithmetic number, because the mean of its divisors is an integer number (1533249363100).

Almost surely, 2^{21010021001012} is an apocalyptic number.

It is an amenable number.

21010021001012 is a deficient number, since it is larger than the sum of its proper divisors (15787963713388).

21010021001012 is a wasteful number, since it uses less digits than its factorization.

21010021001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200495 (or 200493 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010021001012 its reverse (21010012001012), we get a palindrome (42020033002024).

Subtracting from 21010021001012 its reverse (21010012001012), we obtain a square (9000000 = 3000²).

The spelling of 21010021001012 in words is "twenty-one trillion, ten billion, twenty-one million, one thousand, twelve".