7121403972 has 72 divisors (see below), whose sum is σ = 19103980896. Its totient is φ = 2229037824.

The previous prime is 7121403941. The next prime is 7121403973. The reversal of 7121403972 is 2793041217.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (7121403973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 257983 + ... + 284249.

It is an arithmetic number, because the mean of its divisors is an integer number (265333068).

Almost surely, 2^7121403972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7121403972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9551990448).

7121403972 is an abundant number, since it is smaller than the sum of its proper divisors (11982576924).

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

7121403972 is a wasteful number, since it uses less digits than its factorization.

7121403972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26737 (or 26732 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 7121403972 is about 84388.4113608024. The cubic root of 7121403972 is about 1923.9267844281.

The spelling of 7121403972 in words is "seven billion, one hundred twenty-one million, four hundred three thousand, nine hundred seventy-two".