21553432656253 has 8 divisors (see below), whose sum is σ = 21575833896672. Its totient is φ = 21531042664656.

The previous prime is 21553432656191. The next prime is 21553432656271. The reversal of 21553432656253 is 35265623435512.

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 21553432656253 - 2¹⁷ = 21553432525181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21553432656253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21553432656653) 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, 1024626 + ... + 6645052.

It is an arithmetic number, because the mean of its divisors is an integer number (2696979237084).

Almost surely, 2^{21553432656253} is an apocalyptic number.

It is an amenable number.

21553432656253 is a deficient number, since it is larger than the sum of its proper divisors (22401240419).

21553432656253 is a wasteful number, since it uses less digits than its factorization.

21553432656253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5624411.

The product of its digits is 19440000, while the sum is 52.

The spelling of 21553432656253 in words is "twenty-one trillion, five hundred fifty-three billion, four hundred thirty-two million, six hundred fifty-six thousand, two hundred fifty-three".