21019019210 has 32 divisors (see below), whose sum is σ = 43831452672. Its totient is φ = 7107799680.

The previous prime is 21019019209. The next prime is 21019019261. The reversal of 21019019210 is 1291091012.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21019019210.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2051546 + ... + 2061765.

It is an arithmetic number, because the mean of its divisors is an integer number (1369732896).

Almost surely, 2^21019019210 is an apocalyptic number.

21019019210 is an abundant number, since it is smaller than the sum of its proper divisors (22812433462).

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

21019019210 is a wasteful number, since it uses less digits than its factorization.

21019019210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113398.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 21019019210 in words is "twenty-one billion, nineteen million, nineteen thousand, two hundred ten".