21221221023130 has 16 divisors (see below), whose sum is σ = 38202729752520. Its totient is φ = 8487481317952.

The previous prime is 21221221023109. The next prime is 21221221023173. The reversal of 21221221023130 is 3132012212212.

It can be written as a sum of positive squares in 4 ways, for example, as 18394071346561 + 2827149676569 = 4288831^2 + 1681413^2 .

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, 125797909 + ... + 125966488.

Almost surely, 2^{21221221023130} is an apocalyptic number.

21221221023130 is a deficient number, since it is larger than the sum of its proper divisors (16981508729390).

21221221023130 is a wasteful number, since it uses less digits than its factorization.

21221221023130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251772833.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21221221023130 its reverse (3132012212212), we get a palindrome (24353233235342).

The spelling of 21221221023130 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-three thousand, one hundred thirty".