21221101040 has 40 divisors (see below), whose sum is σ = 49391890800. Its totient is φ = 8479351296.

The previous prime is 21221101019. The next prime is 21221101063. The reversal of 21221101040 is 4010112212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66590 + ... + 216509.

It is an arithmetic number, because the mean of its divisors is an integer number (1234797270).

Almost surely, 2^21221101040 is an apocalyptic number.

21221101040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221101040 is an abundant number, since it is smaller than the sum of its proper divisors (28170789760).

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

21221101040 is a wasteful number, since it uses less digits than its factorization.

21221101040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284049 (or 284043 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21221101040 its reverse (4010112212), we get a palindrome (25231213252).

The spelling of 21221101040 in words is "twenty-one billion, two hundred twenty-one million, one hundred one thousand, forty".