21032542278 has 96 divisors (see below), whose sum is σ = 50109725952. Its totient is φ = 6322881600.

The previous prime is 21032542231. The next prime is 21032542319. The reversal of 21032542278 is 87224523012.

21032542278 is a `hidden beast` number, since 2 + 10 + 32 + 542 + 2 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20399623 + ... + 20400653.

It is an arithmetic number, because the mean of its divisors is an integer number (521976312).

Almost surely, 2^21032542278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21032542278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25054862976).

21032542278 is an abundant number, since it is smaller than the sum of its proper divisors (29077183674).

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

21032542278 is a wasteful number, since it uses less digits than its factorization.

21032542278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 21032542278 in words is "twenty-one billion, thirty-two million, five hundred forty-two thousand, two hundred seventy-eight".