11920029511 has 24 divisors (see below), whose sum is σ = 13357301760. Its totient is φ = 10621447200.

The previous prime is 11920029509. The next prime is 11920029533. The reversal of 11920029511 is 11592002911.

It is not a de Polignac number, because 11920029511 - 2¹ = 11920029509 is a prime.

It is a super-2 number, since 2×11920029511² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11920029551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2255370 + ... + 2260648.

It is an arithmetic number, because the mean of its divisors is an integer number (556554240).

Almost surely, 2^11920029511 is an apocalyptic number.

11920029511 is a deficient number, since it is larger than the sum of its proper divisors (1437272249).

11920029511 is a wasteful number, since it uses less digits than its factorization.

11920029511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5767 (or 5754 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 31.

The spelling of 11920029511 in words is "eleven billion, nine hundred twenty million, twenty-nine thousand, five hundred eleven".