21340012156 has 12 divisors (see below), whose sum is σ = 37346113168. Its totient is φ = 10669694112.

The previous prime is 21340012151. The next prime is 21340012163. The reversal of 21340012156 is 65121004312.

It is a happy number.

It is a super-2 number, since 2×21340012156² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21340012156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340012151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149920 + ... + 255256.

Almost surely, 2^21340012156 is an apocalyptic number.

It is an amenable number.

21340012156 is a deficient number, since it is larger than the sum of its proper divisors (16006101012).

21340012156 is a wasteful number, since it uses less digits than its factorization.

21340012156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155988 (or 155986 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21340012156 its reverse (65121004312), we get a palindrome (86461016468).

The spelling of 21340012156 in words is "twenty-one billion, three hundred forty million, twelve thousand, one hundred fifty-six".