21403214312 has 8 divisors (see below), whose sum is σ = 40131026850. Its totient is φ = 10701607152.

The previous prime is 21403214311. The next prime is 21403214347. The reversal of 21403214312 is 21341230412.

It can be written as a sum of positive squares in only one way, i.e., 11480265316 + 9922948996 = 107146^2 + 99614^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21403214311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1337700887 + ... + 1337700902.

Almost surely, 2^21403214312 is an apocalyptic number.

It is an amenable number.

21403214312 is a deficient number, since it is larger than the sum of its proper divisors (18727812538).

21403214312 is a wasteful number, since it uses less digits than its factorization.

21403214312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675401795 (or 2675401791 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21403214312 its reverse (21341230412), we get a palindrome (42744444724).

The spelling of 21403214312 in words is "twenty-one billion, four hundred three million, two hundred fourteen thousand, three hundred twelve".