21337504721006 has 4 divisors (see below), whose sum is σ = 32006257081512. Its totient is φ = 10668752360502.

The previous prime is 21337504720999. The next prime is 21337504721011. The reversal of 21337504721006 is 60012740573312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5334376180250 + ... + 5334376180253.

It is an arithmetic number, because the mean of its divisors is an integer number (8001564270378).

Almost surely, 2^{21337504721006} is an apocalyptic number.

21337504721006 is a deficient number, since it is larger than the sum of its proper divisors (10668752360506).

21337504721006 is a wasteful number, since it uses less digits than its factorization.

21337504721006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10668752360505.

The product of its (nonzero) digits is 211680, while the sum is 41.

The spelling of 21337504721006 in words is "twenty-one trillion, three hundred thirty-seven billion, five hundred four million, seven hundred twenty-one thousand, six".