21253373356 has 6 divisors (see below), whose sum is σ = 37193403380. Its totient is φ = 10626686676.

The previous prime is 21253373287. The next prime is 21253373363. The reversal of 21253373356 is 65337335212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2656671666 + ... + 2656671673.

Almost surely, 2^21253373356 is an apocalyptic number.

It is an amenable number.

21253373356 is a deficient number, since it is larger than the sum of its proper divisors (15940030024).

21253373356 is a wasteful number, since it uses less digits than its factorization.

21253373356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5313343343 (or 5313343341 counting only the distinct ones).

The product of its digits is 340200, while the sum is 40.

The spelling of 21253373356 in words is "twenty-one billion, two hundred fifty-three million, three hundred seventy-three thousand, three hundred fifty-six".