21221210141 has 4 divisors (see below), whose sum is σ = 21290334912. Its totient is φ = 21152085372.

The previous prime is 21221210137. The next prime is 21221210147. The reversal of 21221210141 is 14101212212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21221210141 - 2² = 21221210137 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221210147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34561925 + ... + 34562538.

It is an arithmetic number, because the mean of its divisors is an integer number (5322583728).

Almost surely, 2^21221210141 is an apocalyptic number.

It is an amenable number.

21221210141 is a deficient number, since it is larger than the sum of its proper divisors (69124771).

21221210141 is an equidigital number, since it uses as much as digits as its factorization.

21221210141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69124770.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221210141 its reverse (14101212212), we get a palindrome (35322422353).

The spelling of 21221210141 in words is "twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred forty-one".