21031202 has 4 divisors (see below), whose sum is σ = 31546806. Its totient is φ = 10515600.

The previous prime is 21031187. The next prime is 21031217. The reversal of 21031202 is 20213012.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21031187) and next prime (21031217).

It can be written as a sum of positive squares in only one way, i.e., 19545241 + 1485961 = 4421^2 + 1219^2 .

It is a super-2 number, since 2×21031202² = 884622915129608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257799 + ... + 5257802.

Almost surely, 2^21031202 is an apocalyptic number.

21031202 is a deficient number, since it is larger than the sum of its proper divisors (10515604).

21031202 is a wasteful number, since it uses less digits than its factorization.

21031202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10515603.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21031202 is about 4585.9788486211. The cubic root of 21031202 is about 276.0289912135.

Adding to 21031202 its reverse (20213012), we get a palindrome (41244214).

The spelling of 21031202 in words is "twenty-one million, thirty-one thousand, two hundred two".