21221020102 has 8 divisors (see below), whose sum is σ = 32508796896. Its totient is φ = 10384754472.

The previous prime is 21221020061. The next prime is 21221020133. The reversal of 21221020102 is 20102012212.

It is a happy number.

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

It is a congruent number.

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, 112877673 + ... + 112877860.

It is an arithmetic number, because the mean of its divisors is an integer number (4063599612).

Almost surely, 2^21221020102 is an apocalyptic number.

21221020102 is a deficient number, since it is larger than the sum of its proper divisors (11287776794).

21221020102 is a wasteful number, since it uses less digits than its factorization.

21221020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225755582.

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

Adding to 21221020102 its reverse (20102012212), we get a palindrome (41323032314).

The spelling of 21221020102 in words is "twenty-one billion, two hundred twenty-one million, twenty thousand, one hundred two".