21011111100210 has 256 divisors, whose sum is σ = 63649602551808. Its totient is φ = 4311816364800.

The previous prime is 21011111100173. The next prime is 21011111100223. The reversal of 21011111100210 is 1200111111012.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 588018045 + ... + 588053775.

It is an arithmetic number, because the mean of its divisors is an integer number (248631259968).

Almost surely, 2^{21011111100210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011111100210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31824801275904).

21011111100210 is an abundant number, since it is smaller than the sum of its proper divisors (42638491451598).

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

21011111100210 is a wasteful number, since it uses less digits than its factorization.

21011111100210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38909.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21011111100210 its reverse (1200111111012), we get a palindrome (22211222211222).

It can be divided in two parts, 210111111002 and 10, that added together give a palindrome (210111111012).

The spelling of 21011111100210 in words is "twenty-one trillion, eleven billion, one hundred eleven million, one hundred thousand, two hundred ten".