21021112002111 has 24 divisors (see below), whose sum is σ = 30351314442240. Its totient is φ = 12935512021536.

The previous prime is 21021112002109. The next prime is 21021112002113. The reversal of 21021112002111 is 11120021112012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21021112002109) and next prime (21021112002113).

It is not a de Polignac number, because 21021112002111 - 2¹ = 21021112002109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021112002113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11053570 + ... + 12814976.

It is an arithmetic number, because the mean of its divisors is an integer number (1264638101760).

Almost surely, 2^{21021112002111} is an apocalyptic number.

21021112002111 is a deficient number, since it is larger than the sum of its proper divisors (9330202440129).

21021112002111 is a wasteful number, since it uses less digits than its factorization.

21021112002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784975 (or 1784962 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21021112002111 its reverse (11120021112012), we get a palindrome (32141133114123).

The spelling of 21021112002111 in words is "twenty-one trillion, twenty-one billion, one hundred twelve million, two thousand, one hundred eleven".