21253250504013 has 8 divisors (see below), whose sum is σ = 30913818914976. Its totient is φ = 12880757881200.

The previous prime is 21253250503973. The next prime is 21253250504027. The reversal of 21253250504013 is 31040505235212.

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

It is not a de Polignac number, because 21253250504013 - 2⁸ = 21253250503757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 644037894061 = 21253250504013 / (2 + 1 + 2 + 5 + 3 + 2 + 5 + 0 + 5 + 0 + 4 + 0 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253250504053) 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, 322018946998 + ... + 322018947063.

It is an arithmetic number, because the mean of its divisors is an integer number (3864227364372).

Almost surely, 2^{21253250504013} is an apocalyptic number.

It is an amenable number.

21253250504013 is a deficient number, since it is larger than the sum of its proper divisors (9660568410963).

21253250504013 is a wasteful number, since it uses less digits than its factorization.

21253250504013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644037894075.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 21253250504013 its reverse (31040505235212), we get a palindrome (52293755739225).

The spelling of 21253250504013 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred fifty million, five hundred four thousand, thirteen".