21221551030102 has 32 divisors (see below), whose sum is σ = 33316282041120. Its totient is φ = 10127957575680.

The previous prime is 21221551030093. The next prime is 21221551030171. The reversal of 21221551030102 is 20103015512212.

It is a happy number.

It is a congruent number.

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, 4491403 + ... + 7913014.

It is an arithmetic number, because the mean of its divisors is an integer number (1041133813785).

Almost surely, 2^{21221551030102} is an apocalyptic number.

21221551030102 is a deficient number, since it is larger than the sum of its proper divisors (12094731011018).

21221551030102 is a wasteful number, since it uses less digits than its factorization.

21221551030102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404896.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21221551030102 its reverse (20103015512212), we get a palindrome (41324566542314).

The spelling of 21221551030102 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred fifty-one million, thirty thousand, one hundred two".