20811721270 has 8 divisors (see below), whose sum is σ = 37461098304. Its totient is φ = 8324688504.

The previous prime is 20811721253. The next prime is 20811721277. The reversal of 20811721270 is 7212711802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20811721277) 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, 1040586054 + ... + 1040586073.

It is an arithmetic number, because the mean of its divisors is an integer number (4682637288).

Almost surely, 2^20811721270 is an apocalyptic number.

20811721270 is a deficient number, since it is larger than the sum of its proper divisors (16649377034).

20811721270 is a wasteful number, since it uses less digits than its factorization.

20811721270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081172134.

The product of its (nonzero) digits is 3136, while the sum is 31.

The spelling of 20811721270 in words is "twenty billion, eight hundred eleven million, seven hundred twenty-one thousand, two hundred seventy".