21545000035511 has 4 divisors (see below), whose sum is σ = 21548319253224. Its totient is φ = 21541680817800.

The previous prime is 21545000035469. The next prime is 21545000035543. The reversal of 21545000035511 is 11553000054512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21545000035511 is a prime.

It is a super-2 number, since 2×21545000035511² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545000035571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1659599120 + ... + 1659612101.

It is an arithmetic number, because the mean of its divisors is an integer number (5387079813306).

Almost surely, 2^{21545000035511} is an apocalyptic number.

21545000035511 is a deficient number, since it is larger than the sum of its proper divisors (3319217713).

21545000035511 is an equidigital number, since it uses as much as digits as its factorization.

21545000035511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319217712.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 21545000035511 in words is "twenty-one trillion, five hundred forty-five billion, thirty-five thousand, five hundred eleven".