20211312515 has 8 divisors (see below), whose sum is σ = 24376690800. Its totient is φ = 16086972832.

The previous prime is 20211312503. The next prime is 20211312547. The reversal of 20211312515 is 51521311202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20211312515 - 2¹² = 20211308419 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10258565 + ... + 10260534.

It is an arithmetic number, because the mean of its divisors is an integer number (3047086350).

Almost surely, 2^20211312515 is an apocalyptic number.

20211312515 is a deficient number, since it is larger than the sum of its proper divisors (4165378285).

20211312515 is a wasteful number, since it uses less digits than its factorization.

20211312515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20519301.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 20211312515 its reverse (51521311202), we get a palindrome (71732623717).

The spelling of 20211312515 in words is "twenty billion, two hundred eleven million, three hundred twelve thousand, five hundred fifteen".