245700021 has 8 divisors (see below), whose sum is σ = 374400064. Its totient is φ = 140400000.

The previous prime is 245699999. The next prime is 245700023. The reversal of 245700021 is 120007542.

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

It is not a de Polignac number, because 245700021 - 2⁵ = 245699989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 11700001 = 245700021 / (2 + 4 + 5 + 7 + 0 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245700023) 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, 5849980 + ... + 5850021.

It is an arithmetic number, because the mean of its divisors is an integer number (46800008).

Almost surely, 2^245700021 is an apocalyptic number.

245700021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

245700021 is a deficient number, since it is larger than the sum of its proper divisors (128700043).

245700021 is a wasteful number, since it uses less digits than its factorization.

245700021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11700011.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 245700021 is about 15674.8212429999. The cubic root of 245700021 is about 626.3278614431.

Adding to 245700021 its reverse (120007542), we get a palindrome (365707563).

The spelling of 245700021 in words is "two hundred forty-five million, seven hundred thousand, twenty-one".