1621257004 has 12 divisors (see below), whose sum is σ = 2986526200. Its totient is φ = 767963808.

The previous prime is 1621256957. The next prime is 1621257013. The reversal of 1621257004 is 4007521261.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10666089 + ... + 10666240.

Almost surely, 2^1621257004 is an apocalyptic number.

It is an amenable number.

1621257004 is a deficient number, since it is larger than the sum of its proper divisors (1365269196).

1621257004 is a wasteful number, since it uses less digits than its factorization.

1621257004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21332352 (or 21332350 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1621257004 is about 40264.8358248236. The cubic root of 1621257004 is about 1174.7639795143.

Adding to 1621257004 its reverse (4007521261), we get a palindrome (5628778265).

The spelling of 1621257004 in words is "one billion, six hundred twenty-one million, two hundred fifty-seven thousand, four".