21134540245154 has 16 divisors (see below), whose sum is σ = 36582394213248. Its totient is φ = 8969721656832.

The previous prime is 21134540245079. The next prime is 21134540245201. The reversal of 21134540245154 is 45154204543112.

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, 7328202527 + ... + 7328205410.

It is an arithmetic number, because the mean of its divisors is an integer number (2286399638328).

Almost surely, 2^{21134540245154} is an apocalyptic number.

21134540245154 is a deficient number, since it is larger than the sum of its proper divisors (15447853968094).

21134540245154 is a wasteful number, since it uses less digits than its factorization.

21134540245154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14656408049.

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 21134540245154 its reverse (45154204543112), we get a palindrome (66288744788266).

The spelling of 21134540245154 in words is "twenty-one trillion, one hundred thirty-four billion, five hundred forty million, two hundred forty-five thousand, one hundred fifty-four".