21970239515 has 24 divisors (see below), whose sum is σ = 32002089120. Its totient is φ = 14410290048.

The previous prime is 21970239497. The next prime is 21970239517. The reversal of 21970239515 is 51593207912.

It is a happy number.

It is not a de Polignac number, because 21970239515 - 2¹⁰ = 21970238491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21970239517) 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, 1943810 + ... + 1955079.

It is an arithmetic number, because the mean of its divisors is an integer number (1333420380).

Almost surely, 2^21970239515 is an apocalyptic number.

21970239515 is a deficient number, since it is larger than the sum of its proper divisors (10031849605).

21970239515 is a wasteful number, since it uses less digits than its factorization.

21970239515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3898931 (or 3898924 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 21970239515 in words is "twenty-one billion, nine hundred seventy million, two hundred thirty-nine thousand, five hundred fifteen".