20101321090 has 8 divisors (see below), whose sum is σ = 36182377980. Its totient is φ = 8040528432.

The previous prime is 20101320977. The next prime is 20101321091. The reversal of 20101321090 is 9012310102.

It can be written as a sum of positive squares in 2 ways, for example, as 18595958689 + 1505362401 = 136367^2 + 38799^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20101321091) 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, 1005066045 + ... + 1005066064.

Almost surely, 2^20101321090 is an apocalyptic number.

20101321090 is a deficient number, since it is larger than the sum of its proper divisors (16081056890).

20101321090 is a wasteful number, since it uses less digits than its factorization.

20101321090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010132116.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 20101321090 its reverse (9012310102), we get a palindrome (29113631192).

The spelling of 20101321090 in words is "twenty billion, one hundred one million, three hundred twenty-one thousand, ninety".