21001652071 has 16 divisors (see below), whose sum is σ = 22935427200. Its totient is φ = 19154687328.

The previous prime is 21001652051. The next prime is 21001652081. The reversal of 21001652071 is 17025610012.

It is a cyclic number.

It is not a de Polignac number, because 21001652071 - 2¹¹ = 21001650023 is a prime.

It is a super-2 number, since 2×21001652071² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001652051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136276 + ... + 246118.

It is an arithmetic number, because the mean of its divisors is an integer number (1433464200).

Almost surely, 2^21001652071 is an apocalyptic number.

21001652071 is a deficient number, since it is larger than the sum of its proper divisors (1933775129).

21001652071 is a wasteful number, since it uses less digits than its factorization.

21001652071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110238.

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 21001652071 in words is "twenty-one billion, one million, six hundred fifty-two thousand, seventy-one".