1621031223100 has 36 divisors (see below), whose sum is σ = 3517741473400. Its totient is φ = 648393370560.

The previous prime is 1621031223043. The next prime is 1621031223139. The reversal of 1621031223100 is 13221301261.

It is a happy number.

It is a super-2 number, since 2×1621031223100² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3453286 + ... + 3894514.

Almost surely, 2^{1621031223100} is an apocalyptic number.

1621031223100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621031223100 is an abundant number, since it is smaller than the sum of its proper divisors (1896710250300).

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

1621031223100 is a wasteful number, since it uses less digits than its factorization.

1621031223100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477982 (or 477975 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1621031223100 its reverse (13221301261), we get a palindrome (1634252524361).

The spelling of 1621031223100 in words is "one trillion, six hundred twenty-one billion, thirty-one million, two hundred twenty-three thousand, one hundred".