21220107438612 has 96 divisors (see below), whose sum is σ = 52578897154560. Its totient is φ = 6637898741760.

The previous prime is 21220107438599. The next prime is 21220107438659. The reversal of 21220107438612 is 21683470102212.

It is a happy number.

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, 447761814 + ... + 447809202.

It is an arithmetic number, because the mean of its divisors is an integer number (547696845360).

Almost surely, 2^{21220107438612} 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 21220107438612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26289448577280).

21220107438612 is an abundant number, since it is smaller than the sum of its proper divisors (31358789715948).

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

21220107438612 is a wasteful number, since it uses less digits than its factorization.

21220107438612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53761 (or 53759 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 21220107438612 in words is "twenty-one trillion, two hundred twenty billion, one hundred seven million, four hundred thirty-eight thousand, six hundred twelve".