11022221556 has 48 divisors (see below), whose sum is σ = 30080142400. Its totient is φ = 3480700896.

The previous prime is 11022221531. The next prime is 11022221569. The reversal of 11022221556 is 65512222011.

11022221556 is a `hidden beast` number, since 1 + 102 + 2 + 2 + 2 + 1 + 556 = 666.

It is a super-2 number, since 2×11022221556² (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 an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2683675 + ... + 2687778.

Almost surely, 2^11022221556 is an apocalyptic number.

It is an amenable number.

11022221556 is an abundant number, since it is smaller than the sum of its proper divisors (19057920844).

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

11022221556 is a wasteful number, since it uses less digits than its factorization.

11022221556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371485 (or 5371477 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 11022221556 its reverse (65512222011), we get a palindrome (76534443567).

The spelling of 11022221556 in words is "eleven billion, twenty-two million, two hundred twenty-one thousand, five hundred fifty-six".