21887030 has 64 divisors (see below), whose sum is σ = 46158336. Its totient is φ = 7392000.

The previous prime is 21886999. The next prime is 21887081. The reversal of 21887030 is 3078812.

It is a junction number, because it is equal to n+sod(n) for n = 21886984 and 21887002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103625 + ... + 103835.

It is an arithmetic number, because the mean of its divisors is an integer number (721224).

Almost surely, 2^21887030 is an apocalyptic number.

21887030 is an abundant number, since it is smaller than the sum of its proper divisors (24271306).

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

21887030 is a wasteful number, since it uses less digits than its factorization.

21887030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21887030 is about 4678.3576177971. The cubic root of 21887030 is about 279.7234940412.

The spelling of 21887030 in words is "twenty-one million, eight hundred eighty-seven thousand, thirty".