21350251364 has 12 divisors (see below), whose sum is σ = 40237012284. Its totient is φ = 9853962144.

The previous prime is 21350251357. The next prime is 21350251367. The reversal of 21350251364 is 46315205312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7466342464 + 13883908900 = 86408^2 + 117830^2 .

It is a super-3 number, since 3×21350251364³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21350251364.

It is not an unprimeable number, because it can be changed into a prime (21350251367) 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, 205290827 + ... + 205290930.

It is an arithmetic number, because the mean of its divisors is an integer number (3353084357).

Almost surely, 2^21350251364 is an apocalyptic number.

It is an amenable number.

21350251364 is a deficient number, since it is larger than the sum of its proper divisors (18886760920).

21350251364 is a wasteful number, since it uses less digits than its factorization.

21350251364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410581774 (or 410581772 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21350251364 its reverse (46315205312), we get a palindrome (67665456676).

The spelling of 21350251364 in words is "twenty-one billion, three hundred fifty million, two hundred fifty-one thousand, three hundred sixty-four".