1612021016221 has 32 divisors (see below), whose sum is σ = 2031519409920. Its totient is φ = 1242563328000.

The previous prime is 1612021016183. The next prime is 1612021016261. The reversal of 1612021016221 is 1226101202161.

It is a cyclic number.

It is not a de Polignac number, because 1612021016221 - 2⁷ = 1612021016093 is a prime.

It is a super-2 number, since 2×1612021016221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1612021016261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8594125 + ... + 8779693.

It is an arithmetic number, because the mean of its divisors is an integer number (63484981560).

Almost surely, 2^{1612021016221} is an apocalyptic number.

1612021016221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1612021016221 is a deficient number, since it is larger than the sum of its proper divisors (419498393699).

1612021016221 is a wasteful number, since it uses less digits than its factorization.

1612021016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186805.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 1612021016221 its reverse (1226101202161), we get a palindrome (2838122218382).

The spelling of 1612021016221 in words is "one trillion, six hundred twelve billion, twenty-one million, sixteen thousand, two hundred twenty-one".