15421226043840 has 672 divisors, whose sum is σ = 51456193597440. Its totient is φ = 3912229601280.

The previous prime is 15421226043827. The next prime is 15421226043841. The reversal of 15421226043840 is 4834062212451.

It is a junction number, because it is equal to n+sod(n) for n = 15421226043792 and 15421226043801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421226043841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33307183449 + ... + 33307183911.

Almost surely, 2^{15421226043840} is an apocalyptic number.

15421226043840 is a gapful number since it is divisible by the number (10) 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 15421226043840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25728096798720).

15421226043840 is an abundant number, since it is smaller than the sum of its proper divisors (36034967553600).

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

15421226043840 is a wasteful number, since it uses less digits than its factorization.

15421226043840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 42.

The spelling of 15421226043840 in words is "fifteen trillion, four hundred twenty-one billion, two hundred twenty-six million, forty-three thousand, eight hundred forty".