21130411212 has 72 divisors (see below), whose sum is σ = 54614471184. Its totient is φ = 6885979776.

The previous prime is 21130411193. The next prime is 21130411261. The reversal of 21130411212 is 21211403112.

21130411212 is a `hidden beast` number, since 2 + 11 + 30 + 411 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 520398 + ... + 559530.

It is an arithmetic number, because the mean of its divisors is an integer number (758534322).

Almost surely, 2^21130411212 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 21130411212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27307235592).

21130411212 is an abundant number, since it is smaller than the sum of its proper divisors (33484059972).

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

21130411212 is a wasteful number, since it uses less digits than its factorization.

21130411212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39479 (or 39474 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21130411212 its reverse (21211403112), we get a palindrome (42341814324).

The spelling of 21130411212 in words is "twenty-one billion, one hundred thirty million, four hundred eleven thousand, two hundred twelve".