21142040212 has 12 divisors (see below), whose sum is σ = 37202983636. Its totient is φ = 10512616320.

The previous prime is 21142040177. The next prime is 21142040219. The reversal of 21142040212 is 21204024112.

It can be written as a sum of positive squares in 2 ways, for example, as 7348947076 + 13793093136 = 85726^2 + 117444^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21142040212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142040219) 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, 14600133 + ... + 14601580.

Almost surely, 2^21142040212 is an apocalyptic number.

It is an amenable number.

21142040212 is a deficient number, since it is larger than the sum of its proper divisors (16060943424).

21142040212 is a wasteful number, since it uses less digits than its factorization.

21142040212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29201898 (or 29201896 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21142040212 its reverse (21204024112), we get a palindrome (42346064324).

The spelling of 21142040212 in words is "twenty-one billion, one hundred forty-two million, forty thousand, two hundred twelve".