21154506250120 has 32 divisors (see below), whose sum is σ = 47597987727000. Its totient is φ = 8461740515328.

The previous prime is 21154506250109. The next prime is 21154506250139. The reversal of 21154506250120 is 2105260545112.

It can be written as a sum of positive squares in 4 ways, for example, as 12065716333476 + 9088789916644 = 3473574^2 + 3014762^2 .

It is a super-2 number, since 2×21154506250120² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3801706 + ... + 7534054.

Almost surely, 2^{21154506250120} is an apocalyptic number.

21154506250120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21154506250120 is an abundant number, since it is smaller than the sum of its proper divisors (26443481476880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154506250120 is a wasteful number, since it uses less digits than its factorization.

21154506250120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874057 (or 3874053 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 21154506250120 its reverse (2105260545112), we get a palindrome (23259766795232).

The spelling of 21154506250120 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred six million, two hundred fifty thousand, one hundred twenty".