21145013335212 has 144 divisors (see below), whose sum is σ = 56990986520832. Its totient is φ = 6063990543360.

The previous prime is 21145013335157. The next prime is 21145013335219. The reversal of 21145013335212 is 21253331054112.

It is a happy number.

It is a super-2 number, since 2×21145013335212² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21145013335219) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2366887 + ... + 6920417.

It is an arithmetic number, because the mean of its divisors is an integer number (395770739728).

Almost surely, 2^{21145013335212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21145013335212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28495493260416).

21145013335212 is an abundant number, since it is smaller than the sum of its proper divisors (35845973185620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21145013335212 is a wasteful number, since it uses less digits than its factorization.

21145013335212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4553688 (or 4553669 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 21145013335212 its reverse (21253331054112), we get a palindrome (42398344389324).

The spelling of 21145013335212 in words is "twenty-one trillion, one hundred forty-five billion, thirteen million, three hundred thirty-five thousand, two hundred twelve".