21947215035 has 16 divisors (see below), whose sum is σ = 35299399680. Its totient is φ = 11643896160.

The previous prime is 21947215019. The next prime is 21947215057. The reversal of 21947215035 is 53051274912.

It is not a de Polignac number, because 21947215035 - 2⁴ = 21947215019 is a prime.

It is a super-4 number, since 4×21947215035⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21947214984 and 21947215002.

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, 3827365 + ... + 3833094.

It is an arithmetic number, because the mean of its divisors is an integer number (2206212480).

Almost surely, 2^21947215035 is an apocalyptic number.

21947215035 is a deficient number, since it is larger than the sum of its proper divisors (13352184645).

21947215035 is a wasteful number, since it uses less digits than its factorization.

21947215035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7660658.

The product of its (nonzero) digits is 75600, while the sum is 39.

Adding to 21947215035 its reverse (53051274912), we get a palindrome (74998489947).

The spelling of 21947215035 in words is "twenty-one billion, nine hundred forty-seven million, two hundred fifteen thousand, thirty-five".