1611122012021 has 8 divisors (see below), whose sum is σ = 1666692973920. Its totient is φ = 1555552052208.

The previous prime is 1611122012009. The next prime is 1611122012033. The reversal of 1611122012021 is 1202102211161.

It is an interprime number because it is at equal distance from previous prime (1611122012009) and next prime (1611122012033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1611122012021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1611122011984 and 1611122012002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611122011021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4636670 + ... + 4972016.

It is an arithmetic number, because the mean of its divisors is an integer number (208336621740).

Almost surely, 2^{1611122012021} is an apocalyptic number.

It is an amenable number.

1611122012021 is a deficient number, since it is larger than the sum of its proper divisors (55570961899).

1611122012021 is a wasteful number, since it uses less digits than its factorization.

1611122012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501043.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1611122012021 its reverse (1202102211161), we get a palindrome (2813224223182).

The spelling of 1611122012021 in words is "one trillion, six hundred eleven billion, one hundred twenty-two million, twelve thousand, twenty-one".