21521341031 has 8 divisors (see below), whose sum is σ = 21983044800. Its totient is φ = 21059795808.

The previous prime is 21521340991. The next prime is 21521341091. The reversal of 21521341031 is 13014312512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21521341031 is a prime.

It is a super-2 number, since 2×21521341031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21521340988 and 21521341006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21521341091) 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, 258545 + ... + 331493.

It is an arithmetic number, because the mean of its divisors is an integer number (2747880600).

Almost surely, 2^21521341031 is an apocalyptic number.

21521341031 is a deficient number, since it is larger than the sum of its proper divisors (461703769).

21521341031 is an equidigital number, since it uses as much as digits as its factorization.

21521341031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79273.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 21521341031 its reverse (13014312512), we get a palindrome (34535653543).

The spelling of 21521341031 in words is "twenty-one billion, five hundred twenty-one million, three hundred forty-one thousand, thirty-one".