21502146641 has 16 divisors (see below), whose sum is σ = 22394610000. Its totient is φ = 20630016000.

The previous prime is 21502146629. The next prime is 21502146647. The reversal of 21502146641 is 14664120512.

It can be written as a sum of positive squares in 8 ways, for example, as 5170329025 + 16331817616 = 71905^2 + 127796^2 .

It is a cyclic number.

It is not a de Polignac number, because 21502146641 - 2⁶ = 21502146577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21502146598 and 21502146607.

It is not an unprimeable number, because it can be changed into a prime (21502146647) 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, 599585 + ... + 634433.

It is an arithmetic number, because the mean of its divisors is an integer number (1399663125).

Almost surely, 2^21502146641 is an apocalyptic number.

It is an amenable number.

21502146641 is a deficient number, since it is larger than the sum of its proper divisors (892463359).

21502146641 is a wasteful number, since it uses less digits than its factorization.

21502146641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35140.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 21502146641 in words is "twenty-one billion, five hundred two million, one hundred forty-six thousand, six hundred forty-one".