21152154261651 has 32 divisors (see below), whose sum is σ = 34073882519040. Its totient is φ = 11401645204224.

The previous prime is 21152154261611. The next prime is 21152154261737. The reversal of 21152154261651 is 15616245125112.

It is not a de Polignac number, because 21152154261651 - 2⁷ = 21152154261523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152154261611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113668660 + ... + 113854593.

It is an arithmetic number, because the mean of its divisors is an integer number (1064808828720).

Almost surely, 2^{21152154261651} is an apocalyptic number.

21152154261651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21152154261651 is a deficient number, since it is larger than the sum of its proper divisors (12921728257389).

21152154261651 is a wasteful number, since it uses less digits than its factorization.

21152154261651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227523515.

The product of its digits is 144000, while the sum is 42.

Adding to 21152154261651 its reverse (15616245125112), we get a palindrome (36768399386763).

The spelling of 21152154261651 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred fifty-four million, two hundred sixty-one thousand, six hundred fifty-one".