21040152131 has 4 divisors (see below), whose sum is σ = 21047797512. Its totient is φ = 21032506752.

The previous prime is 21040152121. The next prime is 21040152137. The reversal of 21040152131 is 13125104012.

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

It is a cyclic number.

It is not a de Polignac number, because 21040152131 - 2¹⁰ = 21040151107 is a prime.

It is a super-2 number, since 2×21040152131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040152137) 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, 3818561 + ... + 3824066.

It is an arithmetic number, because the mean of its divisors is an integer number (5261949378).

Almost surely, 2^21040152131 is an apocalyptic number.

21040152131 is a deficient number, since it is larger than the sum of its proper divisors (7645381).

21040152131 is an equidigital number, since it uses as much as digits as its factorization.

21040152131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7645380.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21040152131 its reverse (13125104012), we get a palindrome (34165256143).

The spelling of 21040152131 in words is "twenty-one billion, forty million, one hundred fifty-two thousand, one hundred thirty-one".