21406216770 has 48 divisors (see below), whose sum is σ = 55767816000. Its totient is φ = 5696872992.

The previous prime is 21406216673. The next prime is 21406216823. The reversal of 21406216770 is 7761260412.

21406216770 is a `hidden beast` number, since 21 + 4 + 0 + 621 + 6 + 7 + 7 + 0 = 666.

It is a super-2 number, since 2×21406216770² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 193414 + ... + 283233.

It is an arithmetic number, because the mean of its divisors is an integer number (1161829500).

Almost surely, 2^21406216770 is an apocalyptic number.

21406216770 is an abundant number, since it is smaller than the sum of its proper divisors (34361599230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21406216770 is a wasteful number, since it uses less digits than its factorization.

21406216770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477159 (or 477156 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 21406216770 in words is "twenty-one billion, four hundred six million, two hundred sixteen thousand, seven hundred seventy".