21880002 has 32 divisors (see below), whose sum is σ = 44649792. Its totient is φ = 7146944.

The previous prime is 21879961. The next prime is 21880009. The reversal of 21880002 is 20008812.

It is not an unprimeable number, because it can be changed into a prime (21880009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110968 + ... + 111164.

It is an arithmetic number, because the mean of its divisors is an integer number (1395306).

Almost surely, 2^21880002 is an apocalyptic number.

21880002 is an abundant number, since it is smaller than the sum of its proper divisors (22769790).

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

21880002 is a wasteful number, since it uses less digits than its factorization.

21880002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 21880002 is about 4677.6064391952. The cubic root of 21880002 is about 279.6935507799.

Adding to 21880002 its reverse (20008812), we get a palindrome (41888814).

The spelling of 21880002 in words is "twenty-one million, eight hundred eighty thousand, two".