20135222501 has 8 divisors (see below), whose sum is σ = 21320922240. Its totient is φ = 18949664448.

The previous prime is 20135222489. The next prime is 20135222509. The reversal of 20135222501 is 10522253102.

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

It is not a de Polignac number, because 20135222501 - 2³⁰ = 19061480677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135222509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438260 + ... + 482018.

It is an arithmetic number, because the mean of its divisors is an integer number (2665115280).

Almost surely, 2^20135222501 is an apocalyptic number.

It is an amenable number.

20135222501 is a deficient number, since it is larger than the sum of its proper divisors (1185699739).

20135222501 is a wasteful number, since it uses less digits than its factorization.

20135222501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70843.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 20135222501 its reverse (10522253102), we get a palindrome (30657475603).

The spelling of 20135222501 in words is "twenty billion, one hundred thirty-five million, two hundred twenty-two thousand, five hundred one".