1621121622007 has 4 divisors (see below), whose sum is σ = 1622961715536. Its totient is φ = 1619281528480.

The previous prime is 1621121621957. The next prime is 1621121622049. The reversal of 1621121622007 is 7002261211261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621121622007 - 2⁷ = 1621121621879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621121622007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621181622007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920045443 + ... + 920047204.

It is an arithmetic number, because the mean of its divisors is an integer number (405740428884).

Almost surely, 2^{1621121622007} is an apocalyptic number.

1621121622007 is a deficient number, since it is larger than the sum of its proper divisors (1840093529).

1621121622007 is an equidigital number, since it uses as much as digits as its factorization.

1621121622007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840093528.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 1621121622007 its reverse (7002261211261), we get a palindrome (8623382833268).

The spelling of 1621121622007 in words is "one trillion, six hundred twenty-one billion, one hundred twenty-one million, six hundred twenty-two thousand, seven".