1621031223122 has 4 divisors (see below), whose sum is σ = 2431546834686. Its totient is φ = 810515611560.

The previous prime is 1621031223043. The next prime is 1621031223139. The reversal of 1621031223122 is 2213221301261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1553311049761 + 67720173361 = 1246319^2 + 260231^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1621031223091 and 1621031223100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405257805779 + ... + 405257805782.

Almost surely, 2^{1621031223122} is an apocalyptic number.

1621031223122 is a deficient number, since it is larger than the sum of its proper divisors (810515611564).

1621031223122 is an equidigital number, since it uses as much as digits as its factorization.

1621031223122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810515611563.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1621031223122 its reverse (2213221301261), we get a palindrome (3834252524383).

The spelling of 1621031223122 in words is "one trillion, six hundred twenty-one billion, thirty-one million, two hundred twenty-three thousand, one hundred twenty-two".