21151100141 has 4 divisors (see below), whose sum is σ = 21238864284. Its totient is φ = 21063336000.

The previous prime is 21151100123. The next prime is 21151100147. The reversal of 21151100141 is 14100115112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7568130025 + 13582970116 = 86995^2 + 116546^2 .

It is a cyclic number.

It is not a de Polignac number, because 21151100141 - 2²² = 21146905837 is a prime.

It is a super-2 number, since 2×21151100141² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151100147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43881710 + ... + 43882191.

It is an arithmetic number, because the mean of its divisors is an integer number (5309716071).

Almost surely, 2^21151100141 is an apocalyptic number.

It is an amenable number.

21151100141 is a deficient number, since it is larger than the sum of its proper divisors (87764143).

21151100141 is an equidigital number, since it uses as much as digits as its factorization.

21151100141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87764142.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 21151100141 its reverse (14100115112), we get a palindrome (35251215253).

The spelling of 21151100141 in words is "twenty-one billion, one hundred fifty-one million, one hundred thousand, one hundred forty-one".