21010502241431 has 16 divisors (see below), whose sum is σ = 21409433485440. Its totient is φ = 20614245331680.

The previous prime is 21010502241403. The next prime is 21010502241473. The reversal of 21010502241431 is 13414220501012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21010502241431 - 2⁴² = 16612455730327 is a prime.

It is a super-2 number, since 2×21010502241431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010502241431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010502241031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16273400 + ... + 17516978.

It is an arithmetic number, because the mean of its divisors is an integer number (1338089592840).

Almost surely, 2^{21010502241431} is an apocalyptic number.

21010502241431 is a deficient number, since it is larger than the sum of its proper divisors (398931244009).

21010502241431 is a wasteful number, since it uses less digits than its factorization.

21010502241431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244654.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21010502241431 its reverse (13414220501012), we get a palindrome (34424722742443).

The spelling of 21010502241431 in words is "twenty-one trillion, ten billion, five hundred two million, two hundred forty-one thousand, four hundred thirty-one".