21428064190 has 64 divisors (see below), whose sum is σ = 42719838336. Its totient is φ = 7687291392.

The previous prime is 21428064181. The next prime is 21428064209. The reversal of 21428064190 is 9146082412.

It is a super-2 number, since 2×21428064190² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3955924 + ... + 3961336.

It is an arithmetic number, because the mean of its divisors is an integer number (667497474).

Almost surely, 2^21428064190 is an apocalyptic number.

21428064190 is a deficient number, since it is larger than the sum of its proper divisors (21291774146).

21428064190 is a wasteful number, since it uses less digits than its factorization.

21428064190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6293.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 21428064190 in words is "twenty-one billion, four hundred twenty-eight million, sixty-four thousand, one hundred ninety".