21501446874 has 16 divisors (see below), whose sum is σ = 43132815840. Its totient is φ = 7145495280.

The previous prime is 21501446873. The next prime is 21501446903. The reversal of 21501446874 is 47864410512.

It is not an unprimeable number, because it can be changed into a prime (21501446873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5411269 + ... + 5415240.

It is an arithmetic number, because the mean of its divisors is an integer number (2695800990).

Almost surely, 2^21501446874 is an apocalyptic number.

21501446874 is an abundant number, since it is smaller than the sum of its proper divisors (21631368966).

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

21501446874 is a wasteful number, since it uses less digits than its factorization.

21501446874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10826845.

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 21501446874 in words is "twenty-one billion, five hundred one million, four hundred forty-six thousand, eight hundred seventy-four".