21253190643337 has 4 divisors (see below), whose sum is σ = 21312391731840. Its totient is φ = 21193989554836.

The previous prime is 21253190643331. The next prime is 21253190643343. The reversal of 21253190643337 is 73334609135212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21253190643331) and next prime (21253190643343).

It is not a de Polignac number, because 21253190643337 - 2³⁵ = 21218830904969 is a prime.

It is a super-2 number, since 2×21253190643337² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21253190643331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29600543713 + ... + 29600544430.

It is an arithmetic number, because the mean of its divisors is an integer number (5328097932960).

Almost surely, 2^{21253190643337} is an apocalyptic number.

It is an amenable number.

21253190643337 is a deficient number, since it is larger than the sum of its proper divisors (59201088503).

21253190643337 is an equidigital number, since it uses as much as digits as its factorization.

21253190643337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59201088502.

The product of its (nonzero) digits is 2449440, while the sum is 49.

Adding to 21253190643337 its reverse (73334609135212), we get a palindrome (94587799778549).

The spelling of 21253190643337 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred ninety million, six hundred forty-three thousand, three hundred thirty-seven".