21012003202 has 4 divisors (see below), whose sum is σ = 31518004806. Its totient is φ = 10506001600.

The previous prime is 21012003167. The next prime is 21012003239. The reversal of 21012003202 is 20230021012.

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., 20492208801 + 519794401 = 143151^2 + 22799^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253000799 + ... + 5253000802.

Almost surely, 2^21012003202 is an apocalyptic number.

21012003202 is a deficient number, since it is larger than the sum of its proper divisors (10506001604).

21012003202 is a wasteful number, since it uses less digits than its factorization.

21012003202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506001603.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21012003202 its reverse (20230021012), we get a palindrome (41242024214).

The spelling of 21012003202 in words is "twenty-one billion, twelve million, three thousand, two hundred two".