209237921022 has 64 divisors (see below), whose sum is σ = 471793512960. Its totient is φ = 61380975744.

The previous prime is 209237920987. The next prime is 209237921063. The reversal of 209237921022 is 220129732902.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360804 + ... + 740712.

It is an arithmetic number, because the mean of its divisors is an integer number (7371773640).

Almost surely, 2^209237921022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209237921022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235896756480).

209237921022 is an abundant number, since it is smaller than the sum of its proper divisors (262555591938).

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

209237921022 is a wasteful number, since it uses less digits than its factorization.

209237921022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380257.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 209237921022 in words is "two hundred nine billion, two hundred thirty-seven million, nine hundred twenty-one thousand, twenty-two".