21025023453437 has 2 divisors, whose sum is σ = 21025023453438. Its totient is φ = 21025023453436.

The previous prime is 21025023453407. The next prime is 21025023453461. The reversal of 21025023453437 is 73435432052012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20594043020356 + 430980433081 = 4538066^2 + 656491^2 .

It is a cyclic number.

It is not a de Polignac number, because 21025023453437 - 2¹² = 21025023449341 is a prime.

It is a super-2 number, since 2×21025023453437² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21025023453394 and 21025023453403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21025023453407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512511726718 + 10512511726719.

It is an arithmetic number, because the mean of its divisors is an integer number (10512511726719).

Almost surely, 2^{21025023453437} is an apocalyptic number.

It is an amenable number.

21025023453437 is a deficient number, since it is larger than the sum of its proper divisors (1).

21025023453437 is an equidigital number, since it uses as much as digits as its factorization.

21025023453437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 41.

The spelling of 21025023453437 in words is "twenty-one trillion, twenty-five billion, twenty-three million, four hundred fifty-three thousand, four hundred thirty-seven".