154721217020 has 96 divisors (see below), whose sum is σ = 364571383680. Its totient is φ = 54867599360.

The previous prime is 154721217011. The next prime is 154721217023. The reversal of 154721217020 is 20712127451.

It is a super-2 number, since 2×154721217020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154721217023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212897 + ... + 595623.

It is an arithmetic number, because the mean of its divisors is an integer number (3797618580).

Almost surely, 2^154721217020 is an apocalyptic number.

154721217020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 154721217020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182285691840).

154721217020 is an abundant number, since it is smaller than the sum of its proper divisors (209850166660).

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

154721217020 is a wasteful number, since it uses less digits than its factorization.

154721217020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382823 (or 382821 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The spelling of 154721217020 in words is "one hundred fifty-four billion, seven hundred twenty-one million, two hundred seventeen thousand, twenty".