121531470 has 64 divisors (see below), whose sum is σ = 318836736. Its totient is φ = 29514240.

The previous prime is 121531469. The next prime is 121531477. The reversal of 121531470 is 74135121.

It is a self number, because there is not a number n which added to its sum of digits gives 121531470.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121531477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11967 + ... + 19653.

It is an arithmetic number, because the mean of its divisors is an integer number (4981824).

Almost surely, 2^121531470 is an apocalyptic number.

121531470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121531470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159418368).

121531470 is an abundant number, since it is smaller than the sum of its proper divisors (197305266).

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

121531470 is a wasteful number, since it uses less digits than its factorization.

121531470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7745.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 121531470 is about 11024.1312582897. The cubic root of 121531470 is about 495.3318456389.

Adding to 121531470 its reverse (74135121), we get a palindrome (195666591).

The spelling of 121531470 in words is "one hundred twenty-one million, five hundred thirty-one thousand, four hundred seventy".