1620221016 has 32 divisors (see below), whose sum is σ = 4226664960. Its totient is φ = 516592032.

The previous prime is 1620221011. The next prime is 1620221027. The reversal of 1620221016 is 6101220261.

It is a super-2 number, since 2×1620221016² = 5250232281376144512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1620220983 and 1620221001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467040 + ... + 1468143.

It is an arithmetic number, because the mean of its divisors is an integer number (132083280).

Almost surely, 2^1620221016 is an apocalyptic number.

It is an amenable number.

1620221016 is an abundant number, since it is smaller than the sum of its proper divisors (2606443944).

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

1620221016 is a wasteful number, since it uses less digits than its factorization.

1620221016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935215 (or 2935211 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1620221016 is about 40251.9690946915. The cubic root of 1620221016 is about 1174.5137003162.

Adding to 1620221016 its reverse (6101220261), we get a palindrome (7721441277).

The spelling of 1620221016 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, sixteen".