21001220200202 has 32 divisors (see below), whose sum is σ = 36174711283200. Its totient is φ = 9043497471600.

The previous prime is 21001220200133. The next prime is 21001220200217. The reversal of 21001220200202 is 20200202210012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57786677 + ... + 58148967.

It is an arithmetic number, because the mean of its divisors is an integer number (1130459727600).

Almost surely, 2^{21001220200202} is an apocalyptic number.

21001220200202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001220200202 is a deficient number, since it is larger than the sum of its proper divisors (15173491082998).

21001220200202 is a wasteful number, since it uses less digits than its factorization.

21001220200202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501002.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21001220200202 its reverse (20200202210012), we get a palindrome (41201422410214).

It can be divided in two parts, 210012 and 20200202, that multiplied together give a palindrome (4242284822424).

The spelling of 21001220200202 in words is "twenty-one trillion, one billion, two hundred twenty million, two hundred thousand, two hundred two".