1621400000 has 252 divisors, whose sum is σ = 4486384728. Its totient is φ = 580800000.

The previous prime is 1621399993. The next prime is 1621400003. The reversal of 1621400000 is 41261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621400003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24199967 + ... + 24200033.

It is an arithmetic number, because the mean of its divisors is an integer number (17803114).

Almost surely, 2^1621400000 is an apocalyptic number.

1621400000 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 1621400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243192364).

1621400000 is an abundant number, since it is smaller than the sum of its proper divisors (2864984728).

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

1621400000 is an frugal number, since it uses more digits than its factorization.

1621400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1621400000 is about 40266.6114789909. The cubic root of 1621400000 is about 1174.7985168334.

Adding to 1621400000 its reverse (41261), we get a palindrome (1621441261).

The spelling of 1621400000 in words is "one billion, six hundred twenty-one million, four hundred thousand".