21000202012216 has 64 divisors (see below), whose sum is σ = 45277996377600. Its totient is φ = 8944593171072.

The previous prime is 21000202012201. The next prime is 21000202012219. The reversal of 21000202012216 is 61221020200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000202012193 and 21000202012202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000202012219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52818435 + ... + 53214541.

It is an arithmetic number, because the mean of its divisors is an integer number (707468693400).

Almost surely, 2^{21000202012216} is an apocalyptic number.

It is an amenable number.

21000202012216 is an abundant number, since it is smaller than the sum of its proper divisors (24277794365384).

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

21000202012216 is a wasteful number, since it uses less digits than its factorization.

21000202012216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401956 (or 401952 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21000202012216 its reverse (61221020200012), we get a palindrome (82221222212228).

The spelling of 21000202012216 in words is "twenty-one trillion, two hundred two million, twelve thousand, two hundred sixteen".