21820253290745 has 64 divisors (see below), whose sum is σ = 33629704657920. Its totient is φ = 13210332208128.

The previous prime is 21820253290673. The next prime is 21820253290783. The reversal of 21820253290745 is 54709235202812.

It is a cyclic number.

It is not a de Polignac number, because 21820253290745 - 2⁸ = 21820253290489 is a prime.

It is a super-2 number, since 2×21820253290745² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21820253290693 and 21820253290702.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 275367791 + ... + 275447019.

It is an arithmetic number, because the mean of its divisors is an integer number (525464135280).

Almost surely, 2^{21820253290745} is an apocalyptic number.

It is an amenable number.

21820253290745 is a deficient number, since it is larger than the sum of its proper divisors (11809451367175).

21820253290745 is a wasteful number, since it uses less digits than its factorization.

21820253290745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105594.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 21820253290745 in words is "twenty-one trillion, eight hundred twenty billion, two hundred fifty-three million, two hundred ninety thousand, seven hundred forty-five".