21206712000 has 112 divisors (see below), whose sum is σ = 70024642272. Its totient is φ = 5655116800.

The previous prime is 21206711993. The next prime is 21206712001. The reversal of 21206712000 is 21760212.

It is not an unprimeable number, because it can be changed into a prime (21206712001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417807 + ... + 465806.

Almost surely, 2^21206712000 is an apocalyptic number.

21206712000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21206712000 is an abundant number, since it is smaller than the sum of its proper divisors (48817930272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21206712000 is an equidigital number, since it uses as much as digits as its factorization.

21206712000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883643 (or 883623 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The spelling of 21206712000 in words is "twenty-one billion, two hundred six million, seven hundred twelve thousand".