21035214431 has 32 divisors (see below), whose sum is σ = 27621457920. Its totient is φ = 15519708000.

The previous prime is 21035214427. The next prime is 21035214437. The reversal of 21035214431 is 13441253012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21035214431 - 2² = 21035214427 is a prime.

It is a super-2 number, since 2×21035214431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21035214431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035214437) 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, 3928406 + ... + 3933756.

It is an arithmetic number, because the mean of its divisors is an integer number (863170560).

Almost surely, 2^21035214431 is an apocalyptic number.

21035214431 is a deficient number, since it is larger than the sum of its proper divisors (6586243489).

21035214431 is a wasteful number, since it uses less digits than its factorization.

21035214431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8075.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21035214431 its reverse (13441253012), we get a palindrome (34476467443).

The spelling of 21035214431 in words is "twenty-one billion, thirty-five million, two hundred fourteen thousand, four hundred thirty-one".