21016956153606 has 32 divisors (see below), whose sum is σ = 48039100505088. Its totient is φ = 6004801667520.

The previous prime is 21016956153601. The next prime is 21016956153619. The reversal of 21016956153606 is 60635165961012.

It is a happy number.

It is a super-2 number, since 2×21016956153606² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016956153601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4405011 + ... + 7838241.

It is an arithmetic number, because the mean of its divisors is an integer number (1501221890784).

Almost surely, 2^{21016956153606} is an apocalyptic number.

21016956153606 is an abundant number, since it is smaller than the sum of its proper divisors (27022144351482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21016956153606 is a wasteful number, since it uses less digits than its factorization.

21016956153606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578996.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The spelling of 21016956153606 in words is "twenty-one trillion, sixteen billion, nine hundred fifty-six million, one hundred fifty-three thousand, six hundred six".