221021020010 has 32 divisors (see below), whose sum is σ = 462125457792. Its totient is φ = 74536361280.

The previous prime is 221021020009. The next prime is 221021020021. The reversal of 221021020010 is 10020120122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221021019973 and 221021020000.

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, 25876412 + ... + 25884951.

It is an arithmetic number, because the mean of its divisors is an integer number (14441420556).

Almost surely, 2^221021020010 is an apocalyptic number.

221021020010 is an abundant number, since it is smaller than the sum of its proper divisors (241104437782).

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

221021020010 is a wasteful number, since it uses less digits than its factorization.

221021020010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51761438.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221021020010 its reverse (10020120122), we get a palindrome (231041140132).

The spelling of 221021020010 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, ten".