21154661340262 has 8 divisors (see below), whose sum is σ = 31871780522136. Its totient is φ = 10530734499552.

The previous prime is 21154661340251. The next prime is 21154661340269. The reversal of 21154661340262 is 26204316645112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154661340269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23298084723 + ... + 23298085630.

It is an arithmetic number, because the mean of its divisors is an integer number (3983972565267).

Almost surely, 2^{21154661340262} is an apocalyptic number.

21154661340262 is a deficient number, since it is larger than the sum of its proper divisors (10717119181874).

21154661340262 is a wasteful number, since it uses less digits than its factorization.

21154661340262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46596170582.

The product of its (nonzero) digits is 414720, while the sum is 43.

Adding to 21154661340262 its reverse (26204316645112), we get a palindrome (47358977985374).

The spelling of 21154661340262 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-one million, three hundred forty thousand, two hundred sixty-two".