21890484907 has 8 divisors (see below), whose sum is σ = 22029692256. Its totient is φ = 21751664832.

The previous prime is 21890484851. The next prime is 21890484923. The reversal of 21890484907 is 70948409812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21890484907 - 2³¹ = 19743001259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21890484977) 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, 17013 + ... + 209929.

It is an arithmetic number, because the mean of its divisors is an integer number (2753711532).

Almost surely, 2^21890484907 is an apocalyptic number.

21890484907 is a deficient number, since it is larger than the sum of its proper divisors (139207349).

21890484907 is a wasteful number, since it uses less digits than its factorization.

21890484907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193637.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 21890484907 in words is "twenty-one billion, eight hundred ninety million, four hundred eighty-four thousand, nine hundred seven".