20212121010 has 256 divisors, whose sum is σ = 53997788160. Its totient is φ = 4825497600.

The previous prime is 20212121009. The next prime is 20212121021. The reversal of 20212121010 is 1012121202.

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, 147533662 + ... + 147533798.

It is an arithmetic number, because the mean of its divisors is an integer number (210928860).

Almost surely, 2^20212121010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20212121010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26998894080).

20212121010 is an abundant number, since it is smaller than the sum of its proper divisors (33785667150).

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

20212121010 is a wasteful number, since it uses less digits than its factorization.

20212121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20212121010 its reverse (1012121202), we get a palindrome (21224242212).

The spelling of 20212121010 in words is "twenty billion, two hundred twelve million, one hundred twenty-one thousand, ten".