11015552421 has 64 divisors (see below), whose sum is σ = 16990560000. Its totient is φ = 7047979776.

The previous prime is 11015552411. The next prime is 11015552437. The reversal of 11015552421 is 12425551011.

It is a happy number.

11015552421 is a `hidden beast` number, since 1 + 101 + 5 + 552 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 11015552421 - 2⁹ = 11015551909 is a prime.

It is a super-2 number, since 2×11015552421² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11015552411) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40949875 + ... + 40950143.

It is an arithmetic number, because the mean of its divisors is an integer number (265477500).

Almost surely, 2^11015552421 is an apocalyptic number.

It is an amenable number.

11015552421 is a deficient number, since it is larger than the sum of its proper divisors (5975007579).

11015552421 is a wasteful number, since it uses less digits than its factorization.

11015552421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 11015552421 in words is "eleven billion, fifteen million, five hundred fifty-two thousand, four hundred twenty-one".