10991299220 has 24 divisors (see below), whose sum is σ = 25180067808. Its totient is φ = 3996836000.

The previous prime is 10991299219. The next prime is 10991299283. The reversal of 10991299220 is 2299219901.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24980006 + ... + 24980445.

It is an arithmetic number, because the mean of its divisors is an integer number (1049169492).

Almost surely, 2^10991299220 is an apocalyptic number.

10991299220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10991299220 is an abundant number, since it is smaller than the sum of its proper divisors (14188768588).

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

10991299220 is a wasteful number, since it uses less digits than its factorization.

10991299220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49960471 (or 49960469 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 10991299220 in words is "ten billion, nine hundred ninety-one million, two hundred ninety-nine thousand, two hundred twenty".