1621101116 has 12 divisors (see below), whose sum is σ = 2839929288. Its totient is φ = 809692752.

The previous prime is 1621101107. The next prime is 1621101127. The reversal of 1621101116 is 6111011261.

It is a happy number.

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, 210191 + ... + 217766.

It is an arithmetic number, because the mean of its divisors is an integer number (236660774).

Almost surely, 2^1621101116 is an apocalyptic number.

It is an amenable number.

1621101116 is a deficient number, since it is larger than the sum of its proper divisors (1218828172).

1621101116 is a wasteful number, since it uses less digits than its factorization.

1621101116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428908 (or 428906 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1621101116 is about 40262.8999949085. The cubic root of 1621101116 is about 1174.7263261222.

Adding to 1621101116 its reverse (6111011261), we get a palindrome (7732112377).

The spelling of 1621101116 in words is "one billion, six hundred twenty-one million, one hundred one thousand, one hundred sixteen".