21619490990 has 32 divisors (see below), whose sum is σ = 40336303104. Its totient is φ = 8337463200.

The previous prime is 21619490989. The next prime is 21619490999. The reversal of 21619490990 is 9909491612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21619490999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311786 + ... + 374765.

It is an arithmetic number, because the mean of its divisors is an integer number (1260509472).

Almost surely, 2^21619490990 is an apocalyptic number.

21619490990 is a deficient number, since it is larger than the sum of its proper divisors (18716812114).

21619490990 is a wasteful number, since it uses less digits than its factorization.

21619490990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686672.

The product of its (nonzero) digits is 314928, while the sum is 50.

The spelling of 21619490990 in words is "twenty-one billion, six hundred nineteen million, four hundred ninety thousand, nine hundred ninety".