21201011999970 has 128 divisors (see below), whose sum is σ = 56428407779328. Its totient is φ = 5054456851200.

The previous prime is 21201011999969. The next prime is 21201012000011. The reversal of 21201011999970 is 7999911010212.

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 63 ways as a sum of consecutive naturals, for example, 113097339 + ... + 113284641.

It is an arithmetic number, because the mean of its divisors is an integer number (440846935776).

Almost surely, 2^{21201011999970} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201011999970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28214203889664).

21201011999970 is an abundant number, since it is smaller than the sum of its proper divisors (35227395779358).

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

21201011999970 is a wasteful number, since it uses less digits than its factorization.

21201011999970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193008.

The product of its (nonzero) digits is 183708, while the sum is 51.

The spelling of 21201011999970 in words is "twenty-one trillion, two hundred one billion, eleven million, nine hundred ninety-nine thousand, nine hundred seventy".