21901376 has 112 divisors (see below), whose sum is σ = 54620160. Its totient is φ = 8501760.

The previous prime is 21901291. The next prime is 21901381. The reversal of 21901376 is 67310912.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263831 + ... + 263913.

It is an arithmetic number, because the mean of its divisors is an integer number (487680).

Almost surely, 2^21901376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21901376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27310080).

21901376 is an abundant number, since it is smaller than the sum of its proper divisors (32718784).

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

21901376 is a wasteful number, since it uses less digits than its factorization.

21901376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21901376 is about 4679.8905970119. The cubic root of 21901376 is about 279.7845962373.

The spelling of 21901376 in words is "twenty-one million, nine hundred one thousand, three hundred seventy-six".