21001212202 has 16 divisors (see below), whose sum is σ = 33167878560. Its totient is φ = 9945521712.

The previous prime is 21001212181. The next prime is 21001212233. The reversal of 21001212202 is 20221210012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96108 + ... + 226360.

It is an arithmetic number, because the mean of its divisors is an integer number (2072992410).

Almost surely, 2^21001212202 is an apocalyptic number.

21001212202 is a deficient number, since it is larger than the sum of its proper divisors (12166666358).

21001212202 is a wasteful number, since it uses less digits than its factorization.

21001212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134517.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21001212202 its reverse (20221210012), we get a palindrome (41222422214).

The spelling of 21001212202 in words is "twenty-one billion, one million, two hundred twelve thousand, two hundred two".