223861000021 has 4 divisors (see below), whose sum is σ = 223864612000. Its totient is φ = 223857388044.

The previous prime is 223861000007. The next prime is 223861000037. The reversal of 223861000021 is 120000168322.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223861000021 is a prime.

It is a super-2 number, since 2×223861000021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223861000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223861004021) 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, 1711371 + ... + 1837528.

It is an arithmetic number, because the mean of its divisors is an integer number (55966153000).

Almost surely, 2^223861000021 is an apocalyptic number.

It is an amenable number.

223861000021 is a deficient number, since it is larger than the sum of its proper divisors (3611979).

223861000021 is an equidigital number, since it uses as much as digits as its factorization.

223861000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611978.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 223861000021 its reverse (120000168322), we get a palindrome (343861168343).

The spelling of 223861000021 in words is "two hundred twenty-three billion, eight hundred sixty-one million, twenty-one", and thus it is an aban number.