21211010001012 has 96 divisors (see below), whose sum is σ = 53859216326272. Its totient is φ = 6457948839936.

The previous prime is 21211010000977. The next prime is 21211010001061. The reversal of 21211010001012 is 21010001011212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80779728 + ... + 81041880.

Almost surely, 2^{21211010001012} 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 21211010001012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26929608163136).

21211010001012 is an abundant number, since it is smaller than the sum of its proper divisors (32648206325260).

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

21211010001012 is a wasteful number, since it uses less digits than its factorization.

21211010001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267617 (or 267615 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211010001012 its reverse (21010001011212), we get a palindrome (42221011012224).

The spelling of 21211010001012 in words is "twenty-one trillion, two hundred eleven billion, ten million, one thousand, twelve".