1622201120021 has 4 divisors (see below), whose sum is σ = 1622211950700. Its totient is φ = 1622190289344.

The previous prime is 1622201120003. The next prime is 1622201120027. The reversal of 1622201120021 is 1200211022261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 611852484100 + 1010348635921 = 782210^2 + 1005161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622201120021 - 2¹⁸ = 1622200857877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1622201119975 and 1622201120002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622201120027) 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, 5187476 + ... + 5491293.

It is an arithmetic number, because the mean of its divisors is an integer number (405552987675).

Almost surely, 2^{1622201120021} is an apocalyptic number.

It is an amenable number.

1622201120021 is a deficient number, since it is larger than the sum of its proper divisors (10830679).

1622201120021 is a wasteful number, since it uses less digits than its factorization.

1622201120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10830678.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1622201120021 its reverse (1200211022261), we get a palindrome (2822412142282).

The spelling of 1622201120021 in words is "one trillion, six hundred twenty-two billion, two hundred one million, one hundred twenty thousand, twenty-one".