1621241244 has 180 divisors, whose sum is σ = 5221084176. Its totient is φ = 435891456.

The previous prime is 1621241243. The next prime is 1621241267. The reversal of 1621241244 is 4421421261.

1621241244 is a `hidden beast` number, since 1 + 621 + 24 + 12 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621241243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 266889 + ... + 272895.

Almost surely, 2^1621241244 is an apocalyptic number.

1621241244 is a gapful number since it is divisible by the number (14) 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 1621241244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2610542088).

1621241244 is an abundant number, since it is smaller than the sum of its proper divisors (3599842932).

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

1621241244 is a wasteful number, since it uses less digits than its factorization.

1621241244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054 (or 6036 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 1621241244 is about 40264.6401200855. The cubic root of 1621241244 is about 1174.7601729329.

The spelling of 1621241244 in words is "one billion, six hundred twenty-one million, two hundred forty-one thousand, two hundred forty-four".