1620211930881 has 8 divisors (see below), whose sum is σ = 2161751161344. Its totient is φ = 1079406993840.

The previous prime is 1620211930871. The next prime is 1620211930889. The reversal of 1620211930881 is 1880391120261.

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

It is not a de Polignac number, because 1620211930881 - 2⁶ = 1620211930817 is a prime.

It is a super-2 number, since 2×1620211930881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1620211930889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183568206 + ... + 183577031.

It is an arithmetic number, because the mean of its divisors is an integer number (270218895168).

Almost surely, 2^{1620211930881} is an apocalyptic number.

It is an amenable number.

1620211930881 is a deficient number, since it is larger than the sum of its proper divisors (541539230463).

1620211930881 is a wasteful number, since it uses less digits than its factorization.

1620211930881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367146711.

The product of its (nonzero) digits is 41472, while the sum is 42.

It can be divided in two parts, 162021 and 1930881, that added together give a palindrome (2092902).

The spelling of 1620211930881 in words is "one trillion, six hundred twenty billion, two hundred eleven million, nine hundred thirty thousand, eight hundred eighty-one".