1621821382 has 8 divisors (see below), whose sum is σ = 2473965000. Its totient is φ = 797166384.

The previous prime is 1621821371. The next prime is 1621821401. The reversal of 1621821382 is 2831281261.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1621821382² = 5260609190224779848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6872007 + ... + 6872242.

It is an arithmetic number, because the mean of its divisors is an integer number (309245625).

Almost surely, 2^1621821382 is an apocalyptic number.

1621821382 is a deficient number, since it is larger than the sum of its proper divisors (852143618).

1621821382 is a wasteful number, since it uses less digits than its factorization.

1621821382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13744310.

The product of its digits is 9216, while the sum is 34.

The square root of 1621821382 is about 40271.8435386313. The cubic root of 1621821382 is about 1174.9002799331.

The spelling of 1621821382 in words is "one billion, six hundred twenty-one million, eight hundred twenty-one thousand, three hundred eighty-two".