21393476212 has 12 divisors (see below), whose sum is σ = 37439653636. Its totient is φ = 10696432320.

The previous prime is 21393476201. The next prime is 21393476213. The reversal of 21393476212 is 21267439312.

It can be written as a sum of positive squares in 2 ways, for example, as 8895130596 + 12498345616 = 94314^2 + 111796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21393476213) 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, 167368 + ... + 266080.

Almost surely, 2^21393476212 is an apocalyptic number.

It is an amenable number.

21393476212 is a deficient number, since it is larger than the sum of its proper divisors (16046177424).

21393476212 is a wasteful number, since it uses less digits than its factorization.

21393476212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152898 (or 152896 counting only the distinct ones).

The product of its digits is 108864, while the sum is 40.

The spelling of 21393476212 in words is "twenty-one billion, three hundred ninety-three million, four hundred seventy-six thousand, two hundred twelve".