4021221000000 has 196 divisors, whose sum is σ = 13299190393184. Its totient is φ = 1072324800000.

The previous prime is 4021220999977. The next prime is 4021221000053. The reversal of 4021221000000 is 1221204.

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

It is a self number, because there is not a number n which added to its sum of digits gives 4021221000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2329797 + ... + 3670203.

Almost surely, 2^{4021221000000} is an apocalyptic number.

4021221000000 is a gapful number since it is divisible by the number (40) 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 4021221000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6649595196592).

4021221000000 is an abundant number, since it is smaller than the sum of its proper divisors (9277969393184).

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

4021221000000 is an frugal number, since it uses more digits than its factorization.

4021221000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340452 (or 1340417 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 4021221000000 its reverse (1221204), we get a palindrome (4021222221204).

The spelling of 4021221000000 in words is "four trillion, twenty-one billion, two hundred twenty-one million", and thus it is an aban number.