1621245012 has 24 divisors (see below), whose sum is σ = 3790500000. Its totient is φ = 539330016.

The previous prime is 1621244993. The next prime is 1621245047. The reversal of 1621245012 is 2105421261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129387 + ... + 141362.

It is an arithmetic number, because the mean of its divisors is an integer number (157937500).

Almost surely, 2^1621245012 is an apocalyptic number.

1621245012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621245012 is an abundant number, since it is smaller than the sum of its proper divisors (2169254988).

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

1621245012 is a wasteful number, since it uses less digits than its factorization.

1621245012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271255 (or 271253 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1621245012 is about 40264.6869104927. The cubic root of 1621245012 is about 1174.7610830365.

Adding to 1621245012 its reverse (2105421261), we get a palindrome (3726666273).

The spelling of 1621245012 in words is "one billion, six hundred twenty-one million, two hundred forty-five thousand, twelve".