21577603949 has 8 divisors (see below), whose sum is σ = 24086628192. Its totient is φ = 19159817040.

The previous prime is 21577603919. The next prime is 21577603967. The reversal of 21577603949 is 94930677512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21577603949 - 2⁸ = 21577603693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21577603949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21577603919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22808834 + ... + 22809779.

It is an arithmetic number, because the mean of its divisors is an integer number (3010828524).

Almost surely, 2^21577603949 is an apocalyptic number.

It is an amenable number.

21577603949 is a deficient number, since it is larger than the sum of its proper divisors (2509024243).

21577603949 is a wasteful number, since it uses less digits than its factorization.

21577603949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45618667.

The product of its (nonzero) digits is 2857680, while the sum is 53.

It can be divided in two parts, 21577 and 603949, that added together give a palindrome (625526).

The spelling of 21577603949 in words is "twenty-one billion, five hundred seventy-seven million, six hundred three thousand, nine hundred forty-nine".