1011721290 has 32 divisors (see below), whose sum is σ = 2429334720. Its totient is φ = 269658624.

The previous prime is 1011721267. The next prime is 1011721297. The reversal of 1011721290 is 921271101.

It is a self number, because there is not a number n which added to its sum of digits gives 1011721290.

It is not an unprimeable number, because it can be changed into a prime (1011721297) 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, 63226 + ... + 77594.

It is an arithmetic number, because the mean of its divisors is an integer number (75916710).

Almost surely, 2^1011721290 is an apocalyptic number.

1011721290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1011721290 is an abundant number, since it is smaller than the sum of its proper divisors (1417613430).

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

1011721290 is a wasteful number, since it uses less digits than its factorization.

1011721290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16726.

The product of its (nonzero) digits is 252, while the sum is 24.

The square root of 1011721290 is about 31807.5665526302. The cubic root of 1011721290 is about 1003.8919298978.

Adding to 1011721290 its reverse (921271101), we get a palindrome (1932992391).

The spelling of 1011721290 in words is "one billion, eleven million, seven hundred twenty-one thousand, two hundred ninety".