21214025166651 has 8 divisors (see below), whose sum is σ = 28289801052480. Its totient is φ = 14140466362632.

The previous prime is 21214025166643. The next prime is 21214025166671. The reversal of 21214025166651 is 15666152041212.

It is a happy number.

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

It is not a de Polignac number, because 21214025166651 - 2³ = 21214025166643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21214025166671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554248125 + ... + 554286398.

It is an arithmetic number, because the mean of its divisors is an integer number (3536225131560).

Almost surely, 2^{21214025166651} is an apocalyptic number.

21214025166651 is a deficient number, since it is larger than the sum of its proper divisors (7075775885829).

21214025166651 is a wasteful number, since it uses less digits than its factorization.

21214025166651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108540905.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21214025166651 in words is "twenty-one trillion, two hundred fourteen billion, twenty-five million, one hundred sixty-six thousand, six hundred fifty-one".