21000557150 has 48 divisors (see below), whose sum is σ = 40000953168. Its totient is φ = 8198400000.

The previous prime is 21000557099. The next prime is 21000557183. The reversal of 21000557150 is 5175500012.

It is a happy number.

It is a super-2 number, since 2×21000557150² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3439100 + ... + 3445200.

It is an arithmetic number, because the mean of its divisors is an integer number (833353191).

Almost surely, 2^21000557150 is an apocalyptic number.

21000557150 is a deficient number, since it is larger than the sum of its proper divisors (19000396018).

21000557150 is a wasteful number, since it uses less digits than its factorization.

21000557150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7757 (or 7752 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 26.

The spelling of 21000557150 in words is "twenty-one billion, five hundred fifty-seven thousand, one hundred fifty".