21770955953 has 4 divisors (see below), whose sum is σ = 22916795760. Its totient is φ = 20625116148.

The previous prime is 21770955949. The next prime is 21770955967. The reversal of 21770955953 is 35955907712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21770955953 - 2² = 21770955949 is a prime.

It is a super-2 number, since 2×21770955953² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21770955895 and 21770955904.

It is not an unprimeable number, because it can be changed into a prime (21770955553) 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, 572919875 + ... + 572919912.

It is an arithmetic number, because the mean of its divisors is an integer number (5729198940).

Almost surely, 2^21770955953 is an apocalyptic number.

It is an amenable number.

21770955953 is a deficient number, since it is larger than the sum of its proper divisors (1145839807).

21770955953 is a wasteful number, since it uses less digits than its factorization.

21770955953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145839806.

The product of its (nonzero) digits is 2976750, while the sum is 53.

The spelling of 21770955953 in words is "twenty-one billion, seven hundred seventy million, nine hundred fifty-five thousand, nine hundred fifty-three".