21870152 has 16 divisors (see below), whose sum is σ = 41217660. Its totient is φ = 10878784.

The previous prime is 21870131. The next prime is 21870161. The reversal of 21870152 is 25107812.

It can be written as a sum of positive squares in 2 ways, for example, as 21771556 + 98596 = 4666^2 + 314^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5363 + ... + 8514.

Almost surely, 2^21870152 is an apocalyptic number.

It is an amenable number.

21870152 is a deficient number, since it is larger than the sum of its proper divisors (19347508).

21870152 is a wasteful number, since it uses less digits than its factorization.

21870152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14080 (or 14076 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 21870152 is about 4676.5534317486. The cubic root of 21870152 is about 279.6515734072.

Adding to 21870152 its reverse (25107812), we get a palindrome (46977964).

It can be divided in two parts, 21870 and 152, that added together give a palindrome (22022).

The spelling of 21870152 in words is "twenty-one million, eight hundred seventy thousand, one hundred fifty-two".