2120021677601 has 4 divisors (see below), whose sum is σ = 2120167568532. Its totient is φ = 2119875786672.

The previous prime is 2120021677589. The next prime is 2120021677607. The reversal of 2120021677601 is 1067761200212.

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 1492954078225 + 627067599376 = 1221865^2 + 791876^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120021677601 - 2¹⁴ = 2120021661217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120021677607) 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, 72923666 + ... + 72952731.

It is an arithmetic number, because the mean of its divisors is an integer number (530041892133).

Almost surely, 2^{2120021677601} is an apocalyptic number.

It is an amenable number.

2120021677601 is a deficient number, since it is larger than the sum of its proper divisors (145890931).

2120021677601 is a wasteful number, since it uses less digits than its factorization.

2120021677601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145890930.

The product of its (nonzero) digits is 14112, while the sum is 35.

Adding to 2120021677601 its reverse (1067761200212), we get a palindrome (3187782877813).

The spelling of 2120021677601 in words is "two trillion, one hundred twenty billion, twenty-one million, six hundred seventy-seven thousand, six hundred one".