21870141072 has 80 divisors (see below), whose sum is σ = 61752089280. Its totient is φ = 6628824576.

The previous prime is 21870141053. The next prime is 21870141103. The reversal of 21870141072 is 27014107812.

It is an alternating number because its digits alternate between even and odd.

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 15 ways as a sum of consecutive naturals, for example, 219747 + ... + 303362.

It is an arithmetic number, because the mean of its divisors is an integer number (771901116).

Almost surely, 2^21870141072 is an apocalyptic number.

It is an amenable number.

21870141072 is an abundant number, since it is smaller than the sum of its proper divisors (39881948208).

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

21870141072 is a wasteful number, since it uses less digits than its factorization.

21870141072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523200 (or 523194 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

Adding to 21870141072 its reverse (27014107812), we get a palindrome (48884248884).

The spelling of 21870141072 in words is "twenty-one billion, eight hundred seventy million, one hundred forty-one thousand, seventy-two".