21870350550 has 36 divisors (see below), whose sum is σ = 58758343020. Its totient is φ = 5832093360.

The previous prime is 21870350521. The next prime is 21870350591. The reversal of 21870350550 is 5505307812.

21870350550 is a `hidden beast` number, since 2 + 1 + 8 + 70 + 35 + 0 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24299940 + ... + 24300839.

It is an arithmetic number, because the mean of its divisors is an integer number (1632176195).

Almost surely, 2^21870350550 is an apocalyptic number.

21870350550 is an abundant number, since it is smaller than the sum of its proper divisors (36887992470).

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

21870350550 is a wasteful number, since it uses less digits than its factorization.

21870350550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48600797 (or 48600789 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 21870350550 in words is "twenty-one billion, eight hundred seventy million, three hundred fifty thousand, five hundred fifty".