21941400 has 192 divisors, whose sum is σ = 76557600. Its totient is φ = 5160960.

The previous prime is 21941399. The next prime is 21941401. The reversal of 21941400 is 414912.

It is an interprime number because it is at equal distance from previous prime (21941399) and next prime (21941401).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21941401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 226152 + ... + 226248.

Almost surely, 2^21941400 is an apocalyptic number.

21941400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21941400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38278800).

21941400 is an abundant number, since it is smaller than the sum of its proper divisors (54616200).

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

21941400 is a wasteful number, since it uses less digits than its factorization.

21941400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21941400 is about 4684.1648134966. The cubic root of 21941400 is about 279.9549247168.

The spelling of 21941400 in words is "twenty-one million, nine hundred forty-one thousand, four hundred".