21006254266 has 8 divisors (see below), whose sum is σ = 31749911424. Its totient is φ = 10422950460.

The previous prime is 21006254257. The next prime is 21006254273. The reversal of 21006254266 is 66245260012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40088010 + ... + 40088533.

It is an arithmetic number, because the mean of its divisors is an integer number (3968738928).

Almost surely, 2^21006254266 is an apocalyptic number.

21006254266 is a deficient number, since it is larger than the sum of its proper divisors (10743657158).

21006254266 is a wasteful number, since it uses less digits than its factorization.

21006254266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80176676.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21006254266 in words is "twenty-one billion, six million, two hundred fifty-four thousand, two hundred sixty-six".