21212001202210 has 64 divisors (see below), whose sum is σ = 46993814509824. Its totient is φ = 6713095392000.

The previous prime is 21212001202121. The next prime is 21212001202211. The reversal of 21212001202210 is 1220210021212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21212001202211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43557060 + ... + 44041360.

It is an arithmetic number, because the mean of its divisors is an integer number (734278351716).

Almost surely, 2^{21212001202210} is an apocalyptic number.

21212001202210 is an abundant number, since it is smaller than the sum of its proper divisors (25781813307614).

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

21212001202210 is a wasteful number, since it uses less digits than its factorization.

21212001202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532459.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212001202210 its reverse (1220210021212), we get a palindrome (22432211223422).

The spelling of 21212001202210 in words is "twenty-one trillion, two hundred twelve billion, one million, two hundred two thousand, two hundred ten".