21245031553154 has 4 divisors (see below), whose sum is σ = 31867547329734. Its totient is φ = 10622515776576.

The previous prime is 21245031553117. The next prime is 21245031553181. The reversal of 21245031553154 is 45135513054212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19249041841129 + 1995989712025 = 4387373^2 + 1412795^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5311257888287 + ... + 5311257888290.

Almost surely, 2^{21245031553154} is an apocalyptic number.

21245031553154 is a deficient number, since it is larger than the sum of its proper divisors (10622515776580).

21245031553154 is a wasteful number, since it uses less digits than its factorization.

21245031553154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10622515776579.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 21245031553154 in words is "twenty-one trillion, two hundred forty-five billion, thirty-one million, five hundred fifty-three thousand, one hundred fifty-four".