21400332212 has 24 divisors (see below), whose sum is σ = 42907421760. Its totient is φ = 9148694400.

The previous prime is 21400332211. The next prime is 21400332227. The reversal of 21400332212 is 21223300412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400332211) 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, 941762 + ... + 964217.

It is an arithmetic number, because the mean of its divisors is an integer number (1787809240).

Almost surely, 2^21400332212 is an apocalyptic number.

It is an amenable number.

21400332212 is an abundant number, since it is smaller than the sum of its proper divisors (21507089548).

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

21400332212 is a wasteful number, since it uses less digits than its factorization.

21400332212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906391 (or 1906389 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21400332212 its reverse (21223300412), we get a palindrome (42623632624).

The spelling of 21400332212 in words is "twenty-one billion, four hundred million, three hundred thirty-two thousand, two hundred twelve".