221421486979960 has 128 divisors (see below), whose sum is σ = 507136886988480. Its totient is φ = 86990137602048.

The previous prime is 221421486979939. The next prime is 221421486979981. The reversal of 221421486979960 is 69979684124122.

It is an interprime number because it is at equal distance from previous prime (221421486979939) and next prime (221421486979981).

It is a self number, because there is not a number n which added to its sum of digits gives 221421486979960.

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, 1118117914 + ... + 1118315926.

Almost surely, 2^{221421486979960} is an apocalyptic number.

221421486979960 is a gapful number since it is divisible by the number (20) 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 221421486979960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253568443494240).

221421486979960 is an abundant number, since it is smaller than the sum of its proper divisors (285715400008520).

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

221421486979960 is a wasteful number, since it uses less digits than its factorization.

221421486979960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199697 (or 199693 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 70.

The spelling of 221421486979960 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, four hundred eighty-six million, nine hundred seventy-nine thousand, nine hundred sixty".