21340401212 has 12 divisors (see below), whose sum is σ = 40218448536. Its totient is φ = 9849415920.

The previous prime is 21340401197. The next prime is 21340401253. The reversal of 21340401212 is 21210404312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205196114 + ... + 205196217.

It is an arithmetic number, because the mean of its divisors is an integer number (3351537378).

Almost surely, 2^21340401212 is an apocalyptic number.

It is an amenable number.

21340401212 is a deficient number, since it is larger than the sum of its proper divisors (18878047324).

21340401212 is a wasteful number, since it uses less digits than its factorization.

21340401212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410392348 (or 410392346 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21340401212 its reverse (21210404312), we get a palindrome (42550805524).

The spelling of 21340401212 in words is "twenty-one billion, three hundred forty million, four hundred one thousand, two hundred twelve".