1620621103201 has 4 divisors (see below), whose sum is σ = 1620653535232. Its totient is φ = 1620588671172.

The previous prime is 1620621103183. The next prime is 1620621103207. The reversal of 1620621103201 is 1023011260261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1620621103201 - 2²⁹ = 1620084232289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620621103207) 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, 16140945 + ... + 16241038.

It is an arithmetic number, because the mean of its divisors is an integer number (405163383808).

Almost surely, 2^{1620621103201} is an apocalyptic number.

It is an amenable number.

1620621103201 is a deficient number, since it is larger than the sum of its proper divisors (32432031).

1620621103201 is an equidigital number, since it uses as much as digits as its factorization.

1620621103201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32432030.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 1620621103201 its reverse (1023011260261), we get a palindrome (2643632363462).

The spelling of 1620621103201 in words is "one trillion, six hundred twenty billion, six hundred twenty-one million, one hundred three thousand, two hundred one".