21000101112021 has 8 divisors (see below), whose sum is σ = 29647201569984. Its totient is φ = 13176534031040.

The previous prime is 21000101111989. The next prime is 21000101112031. The reversal of 21000101112021 is 12021110100012.

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

It is not a de Polignac number, because 21000101112021 - 2⁵ = 21000101111989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000101111988 and 21000101112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000101112031) 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, 205883344185 + ... + 205883344286.

It is an arithmetic number, because the mean of its divisors is an integer number (3705900196248).

Almost surely, 2^{21000101112021} is an apocalyptic number.

It is an amenable number.

21000101112021 is a deficient number, since it is larger than the sum of its proper divisors (8647100457963).

21000101112021 is a wasteful number, since it uses less digits than its factorization.

21000101112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411766688491.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21000101112021 its reverse (12021110100012), we get a palindrome (33021211212033).

The spelling of 21000101112021 in words is "twenty-one trillion, one hundred one million, one hundred twelve thousand, twenty-one".