21031021202 has 8 divisors (see below), whose sum is σ = 31558254156. Its totient is φ = 10511603152.

The previous prime is 21031021177. The next prime is 21031021247. The reversal of 21031021202 is 20212013012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19776515641 + 1254505561 = 140629^2 + 35419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1946993 + ... + 1957764.

Almost surely, 2^21031021202 is an apocalyptic number.

21031021202 is a deficient number, since it is larger than the sum of its proper divisors (10527232954).

21031021202 is a wasteful number, since it uses less digits than its factorization.

21031021202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907452.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21031021202 its reverse (20212013012), we get a palindrome (41243034214).

The spelling of 21031021202 in words is "twenty-one billion, thirty-one million, twenty-one thousand, two hundred two".