21266140222651 has 8 divisors (see below), whose sum is σ = 21437735768064. Its totient is φ = 21094609452840.

The previous prime is 21266140222619. The next prime is 21266140222669. The reversal of 21266140222651 is 15622204166212.

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

It is a cyclic number.

It is not a de Polignac number, because 21266140222651 - 2⁵ = 21266140222619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21266140222051) 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, 15534535 + ... + 16847968.

It is an arithmetic number, because the mean of its divisors is an integer number (2679716971008).

Almost surely, 2^{21266140222651} is an apocalyptic number.

21266140222651 is a deficient number, since it is larger than the sum of its proper divisors (171595545413).

21266140222651 is a wasteful number, since it uses less digits than its factorization.

21266140222651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32387801.

The product of its (nonzero) digits is 138240, while the sum is 40.

Adding to 21266140222651 its reverse (15622204166212), we get a palindrome (36888344388863).

The spelling of 21266140222651 in words is "twenty-one trillion, two hundred sixty-six billion, one hundred forty million, two hundred twenty-two thousand, six hundred fifty-one".