21520150421101 has 8 divisors (see below), whose sum is σ = 21535285078944. Its totient is φ = 21505020491760.

The previous prime is 21520150421027. The next prime is 21520150421113. The reversal of 21520150421101 is 10112405102512.

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 21520150421101 - 2¹³ = 21520150412909 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 (21520150421401) 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, 7948155 + ... + 10305991.

It is an arithmetic number, because the mean of its divisors is an integer number (2691910634868).

Almost surely, 2^{21520150421101} is an apocalyptic number.

It is an amenable number.

21520150421101 is a deficient number, since it is larger than the sum of its proper divisors (15134657843).

21520150421101 is a wasteful number, since it uses less digits than its factorization.

21520150421101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2364251.

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 21520150421101 its reverse (10112405102512), we get a palindrome (31632555523613).

The spelling of 21520150421101 in words is "twenty-one trillion, five hundred twenty billion, one hundred fifty million, four hundred twenty-one thousand, one hundred one".