20521667001 has 8 divisors (see below), whose sum is σ = 29849697504. Its totient is φ = 12437373920.

The previous prime is 20521666999. The next prime is 20521667021. The reversal of 20521667001 is 10076612502.

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 20521667001 - 2¹ = 20521666999 is a prime.

It is a super-2 number, since 2×20521667001² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20521667001.

It is not an unprimeable number, because it can be changed into a prime (20521667021) 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, 310934316 + ... + 310934381.

It is an arithmetic number, because the mean of its divisors is an integer number (3731212188).

Almost surely, 2^20521667001 is an apocalyptic number.

It is an amenable number.

20521667001 is a deficient number, since it is larger than the sum of its proper divisors (9328030503).

20521667001 is a wasteful number, since it uses less digits than its factorization.

20521667001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621868711.

The product of its (nonzero) digits is 5040, while the sum is 30.

The spelling of 20521667001 in words is "twenty billion, five hundred twenty-one million, six hundred sixty-seven thousand, one".