21210201001212 has 24 divisors (see below), whose sum is σ = 49491911280336. Its totient is φ = 7069860960768.

The previous prime is 21210201001133. The next prime is 21210201001309. The reversal of 21210201001212 is 21210010201212.

It is a junction number, because it is equal to n+sod(n) for n = 21210201001191 and 21210201001200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25325743 + ... + 26149830.

It is an arithmetic number, because the mean of its divisors is an integer number (2062162970014).

Almost surely, 2^{21210201001212} is an apocalyptic number.

It is an amenable number.

21210201001212 is an abundant number, since it is smaller than the sum of its proper divisors (28281710279124).

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

21210201001212 is a wasteful number, since it uses less digits than its factorization.

21210201001212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51509917 (or 51509915 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210201001212 its reverse (21210010201212), we get a palindrome (42420211202424).

The spelling of 21210201001212 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, one thousand, two hundred twelve".