21890895070 has 64 divisors (see below), whose sum is σ = 46624600512. Its totient is φ = 7309312000.

The previous prime is 21890895041. The next prime is 21890895097. The reversal of 21890895070 is 7059809812.

It is a super-2 number, since 2×21890895070² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66091 + ... + 219430.

It is an arithmetic number, because the mean of its divisors is an integer number (728509383).

Almost surely, 2^21890895070 is an apocalyptic number.

21890895070 is an abundant number, since it is smaller than the sum of its proper divisors (24733705442).

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

21890895070 is a wasteful number, since it uses less digits than its factorization.

21890895070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285597.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 21890895070 in words is "twenty-one billion, eight hundred ninety million, eight hundred ninety-five thousand, seventy".