21111550004 has 6 divisors (see below), whose sum is σ = 36945212514. Its totient is φ = 10555775000.

The previous prime is 21111549961. The next prime is 21111550039. The reversal of 21111550004 is 40005511112.

It can be written as a sum of positive squares in only one way, i.e., 17796093604 + 3315456400 = 133402^2 + 57580^2 .

It is a super-3 number, since 3×21111550004³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638943747 + ... + 2638943754.

It is an arithmetic number, because the mean of its divisors is an integer number (6157535419).

Almost surely, 2^21111550004 is an apocalyptic number.

It is an amenable number.

21111550004 is a deficient number, since it is larger than the sum of its proper divisors (15833662510).

21111550004 is a wasteful number, since it uses less digits than its factorization.

21111550004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277887505 (or 5277887503 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The spelling of 21111550004 in words is "twenty-one billion, one hundred eleven million, five hundred fifty thousand, four".