2120136621 has 8 divisors (see below), whose sum is σ = 2874761760. Its totient is φ = 1389467952.

The previous prime is 2120136547. The next prime is 2120136631. The reversal of 2120136621 is 1266310212.

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

It is not a de Polignac number, because 2120136621 - 2⁷ = 2120136493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120136591 and 2120136600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120136631) 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, 5988910 + ... + 5989263.

It is an arithmetic number, because the mean of its divisors is an integer number (359345220).

Almost surely, 2^2120136621 is an apocalyptic number.

It is an amenable number.

2120136621 is a deficient number, since it is larger than the sum of its proper divisors (754625139).

2120136621 is a wasteful number, since it uses less digits than its factorization.

2120136621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11978235.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2120136621 is about 46044.9413182382. The cubic root of 2120136621 is about 1284.6592526640.

Adding to 2120136621 its reverse (1266310212), we get a palindrome (3386446833).

The spelling of 2120136621 in words is "two billion, one hundred twenty million, one hundred thirty-six thousand, six hundred twenty-one".