21121210102 has 8 divisors (see below), whose sum is σ = 31704760512. Its totient is φ = 10552956600.

The previous prime is 21121210087. The next prime is 21121210151. The reversal of 21121210102 is 20101212112.

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

It is a super-2 number, since 2×21121210102² (a number of 21 digits) contains 22 as substring.

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, 3820774 + ... + 3826297.

It is an arithmetic number, because the mean of its divisors is an integer number (3963095064).

Almost surely, 2^21121210102 is an apocalyptic number.

21121210102 is a deficient number, since it is larger than the sum of its proper divisors (10583550410).

21121210102 is a wasteful number, since it uses less digits than its factorization.

21121210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7648454.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21121210102 its reverse (20101212112), we get a palindrome (41222422214).

The spelling of 21121210102 in words is "twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred two".