21121111202102 has 32 divisors (see below), whose sum is σ = 33688154741760. Its totient is φ = 9897023606400.

The previous prime is 21121111202099. The next prime is 21121111202161. The reversal of 21121111202102 is 20120211112112.

It is a super-2 number, since 2×21121111202102² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 118152113 + ... + 118330739.

It is an arithmetic number, because the mean of its divisors is an integer number (1052754835680).

Almost surely, 2^{21121111202102} is an apocalyptic number.

21121111202102 is a deficient number, since it is larger than the sum of its proper divisors (12567043539658).

21121111202102 is a wasteful number, since it uses less digits than its factorization.

21121111202102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193436.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121111202102 its reverse (20120211112112), we get a palindrome (41241322314214).

The spelling of 21121111202102 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, two hundred two thousand, one hundred two".