21001801679970 has 32 divisors (see below), whose sum is σ = 52142404173120. Its totient is φ = 5407360432320.

The previous prime is 21001801679921. The next prime is 21001801679993. The reversal of 21001801679970 is 7997610810012.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 12070000096 + ... + 12070001835.

It is an arithmetic number, because the mean of its divisors is an integer number (1629450130410).

Almost surely, 2^{21001801679970} is an apocalyptic number.

21001801679970 is an abundant number, since it is smaller than the sum of its proper divisors (31140602493150).

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

21001801679970 is a wasteful number, since it uses less digits than its factorization.

21001801679970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24140001970.

The product of its (nonzero) digits is 381024, while the sum is 51.

The spelling of 21001801679970 in words is "twenty-one trillion, one billion, eight hundred one million, six hundred seventy-nine thousand, nine hundred seventy".