221021432010 has 96 divisors (see below), whose sum is σ = 600358009680. Its totient is φ = 56343168000.

The previous prime is 221021431997. The next prime is 221021432011. The reversal of 221021432010 is 10234120122.

It is a happy number.

221021432010 is a `hidden beast` number, since 2 + 210 + 21 + 432 + 0 + 1 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 92828074329 + 128193357681 = 304677^2 + 358041^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221021432011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 155611 + ... + 682830.

Almost surely, 2^221021432010 is an apocalyptic number.

221021432010 is an abundant number, since it is smaller than the sum of its proper divisors (379336577670).

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

221021432010 is a wasteful number, since it uses less digits than its factorization.

221021432010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838584 (or 838581 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221021432010 its reverse (10234120122), we get a palindrome (231255552132).

The spelling of 221021432010 in words is "two hundred twenty-one billion, twenty-one million, four hundred thirty-two thousand, ten".