21887425 has 24 divisors (see below), whose sum is σ = 31234112. Its totient is φ = 14904000.

The previous prime is 21887423. The next prime is 21887429. The reversal of 21887425 is 52478812.

It is not a de Polignac number, because 21887425 - 2¹ = 21887423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21887423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31330 + ... + 32020.

Almost surely, 2^21887425 is an apocalyptic number.

21887425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21887425 is a deficient number, since it is larger than the sum of its proper divisors (9346687).

21887425 is a wasteful number, since it uses less digits than its factorization.

21887425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889 (or 884 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 21887425 is about 4678.3998332763. The cubic root of 21887425 is about 279.7251767747.

The spelling of 21887425 in words is "twenty-one million, eight hundred eighty-seven thousand, four hundred twenty-five".