21021001112112 has 40 divisors (see below), whose sum is σ = 55048146757104. Its totient is φ = 6911014063104.

The previous prime is 21021001112107. The next prime is 21021001112113. The reversal of 21021001112112 is 21121110012012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21021001112091 and 21021001112100.

It is not an unprimeable number, because it can be changed into a prime (21021001112113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2999568573 + ... + 2999575580.

Almost surely, 2^{21021001112112} is an apocalyptic number.

It is an amenable number.

21021001112112 is an abundant number, since it is smaller than the sum of its proper divisors (34027145644992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021001112112 is a wasteful number, since it uses less digits than its factorization.

21021001112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5999144237 (or 5999144231 counting only the distinct ones).

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

Adding to 21021001112112 its reverse (21121110012012), we get a palindrome (42142111124124).

The spelling of 21021001112112 in words is "twenty-one trillion, twenty-one billion, one million, one hundred twelve thousand, one hundred twelve".