21224650197212 has 96 divisors (see below), whose sum is σ = 46966900571136. Its totient is φ = 8151773414400.

The previous prime is 21224650197169. The next prime is 21224650197217. The reversal of 21224650197212 is 21279105642212.

It is a happy number.

It is a super-2 number, since 2×21224650197212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224650197217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172192628 + ... + 172315844.

It is an arithmetic number, because the mean of its divisors is an integer number (489238547616).

Almost surely, 2^{21224650197212} is an apocalyptic number.

21224650197212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21224650197212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23483450285568).

21224650197212 is an abundant number, since it is smaller than the sum of its proper divisors (25742250373924).

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

21224650197212 is a wasteful number, since it uses less digits than its factorization.

21224650197212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131187 (or 131185 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 21224650197212 in words is "twenty-one trillion, two hundred twenty-four billion, six hundred fifty million, one hundred ninety-seven thousand, two hundred twelve".