2120972136 has 64 divisors (see below), whose sum is σ = 5516820480. Its totient is φ = 678767040.

The previous prime is 2120972131. The next prime is 2120972219. The reversal of 2120972136 is 6312790212.

It is a junction number, because it is equal to n+sod(n) for n = 2120972097 and 2120972106.

It is not an unprimeable number, because it can be changed into a prime (2120972131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83265 + ... + 105711.

It is an arithmetic number, because the mean of its divisors is an integer number (86200320).

Almost surely, 2^2120972136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2120972136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2758410240).

2120972136 is an abundant number, since it is smaller than the sum of its proper divisors (3395848344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2120972136 is a wasteful number, since it uses less digits than its factorization.

2120972136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22614 (or 22610 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 2120972136 is about 46054.0132453188. The cubic root of 2120972136 is about 1284.8279856752.

The spelling of 2120972136 in words is "two billion, one hundred twenty million, nine hundred seventy-two thousand, one hundred thirty-six".