11721020070 has 32 divisors (see below), whose sum is σ = 28591607520. Its totient is φ = 3074365440.

The previous prime is 11721020057. The next prime is 11721020081. The reversal of 11721020070 is 7002012711.

It is a happy number.

It is a super-2 number, since 2×11721020070² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3200635 + ... + 3204294.

It is an arithmetic number, because the mean of its divisors is an integer number (893487735).

Almost surely, 2^11721020070 is an apocalyptic number.

11721020070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11721020070 is an abundant number, since it is smaller than the sum of its proper divisors (16870587450).

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

11721020070 is a wasteful number, since it uses less digits than its factorization.

11721020070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6405000.

The product of its (nonzero) digits is 196, while the sum is 21.

Adding to 11721020070 its reverse (7002012711), we get a palindrome (18723032781).

The spelling of 11721020070 in words is "eleven billion, seven hundred twenty-one million, twenty thousand, seventy".