102123036621 has 24 divisors (see below), whose sum is σ = 155363158080. Its totient is φ = 64513306176.

The previous prime is 102123036583. The next prime is 102123036661. The reversal of 102123036621 is 126630321201.

102123036621 is a `hidden beast` number, since 1 + 0 + 2 + 1 + 2 + 3 + 0 + 36 + 621 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-102123036621 is a prime.

It is a super-2 number, since 2×102123036621² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102123036661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2283216 + ... + 2327513.

It is an arithmetic number, because the mean of its divisors is an integer number (6473464920).

Almost surely, 2^102123036621 is an apocalyptic number.

It is an amenable number.

102123036621 is a deficient number, since it is larger than the sum of its proper divisors (53240121459).

102123036621 is a wasteful number, since it uses less digits than its factorization.

102123036621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610865 (or 4610862 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 102123036621 its reverse (126630321201), we get a palindrome (228753357822).

The spelling of 102123036621 in words is "one hundred two billion, one hundred twenty-three million, thirty-six thousand, six hundred twenty-one".