21711020070 has 16 divisors (see below), whose sum is σ = 52106448240. Its totient is φ = 5789605344.

The previous prime is 21711020017. The next prime is 21711020083. The reversal of 21711020070 is 7002011712.

It is a happy number.

It is a congruent number.

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, 361850305 + ... + 361850364.

It is an arithmetic number, because the mean of its divisors is an integer number (3256653015).

Almost surely, 2^21711020070 is an apocalyptic number.

21711020070 is an abundant number, since it is smaller than the sum of its proper divisors (30395428170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21711020070 is a wasteful number, since it uses less digits than its factorization.

21711020070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723700679.

The product of its (nonzero) digits is 196, while the sum is 21.

Adding to 21711020070 its reverse (7002011712), we get a palindrome (28713031782).

The spelling of 21711020070 in words is "twenty-one billion, seven hundred eleven million, twenty thousand, seventy".