21513530343154 has 16 divisors (see below), whose sum is σ = 32300637034968. Its totient is φ = 10746651831552.

The previous prime is 21513530343127. The next prime is 21513530343259. The reversal of 21513530343154 is 45134303531512.

It can be written as a sum of positive squares in 4 ways, for example, as 14280803210025 + 7232727133129 = 3778995^2 + 2689373^2 .

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, 107663424 + ... + 107863060.

Almost surely, 2^{21513530343154} is an apocalyptic number.

21513530343154 is a deficient number, since it is larger than the sum of its proper divisors (10787106691814).

21513530343154 is a wasteful number, since it uses less digits than its factorization.

21513530343154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250029.

The product of its (nonzero) digits is 324000, while the sum is 40.

Adding to 21513530343154 its reverse (45134303531512), we get a palindrome (66647833874666).

The spelling of 21513530343154 in words is "twenty-one trillion, five hundred thirteen billion, five hundred thirty million, three hundred forty-three thousand, one hundred fifty-four".