21201002 has 4 divisors (see below), whose sum is σ = 31801506. Its totient is φ = 10600500.

The previous prime is 21200987. The next prime is 21201031. The reversal of 21201002 is 20010212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11082241 + 10118761 = 3329^2 + 3181^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300249 + ... + 5300252.

Almost surely, 2^21201002 is an apocalyptic number.

21201002 is a deficient number, since it is larger than the sum of its proper divisors (10600504).

21201002 is a wasteful number, since it uses less digits than its factorization.

21201002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10600503.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21201002 is about 4604.4545822497. The cubic root of 21201002 is about 276.7698610223.

Adding to 21201002 its reverse (20010212), we get a palindrome (41211214).

The spelling of 21201002 in words is "twenty-one million, two hundred one thousand, two".