21500121330610 has 32 divisors (see below), whose sum is σ = 43870692922560. Its totient is φ = 7520690213568.

The previous prime is 21500121330593. The next prime is 21500121330671. The reversal of 21500121330610 is 1603312100512.

It is a happy number.

It is a super-2 number, since 2×21500121330610² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4352248812 + ... + 4352253751.

It is an arithmetic number, because the mean of its divisors is an integer number (1370959153830).

Almost surely, 2^{21500121330610} is an apocalyptic number.

21500121330610 is an abundant number, since it is smaller than the sum of its proper divisors (22370571591950).

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

21500121330610 is a wasteful number, since it uses less digits than its factorization.

21500121330610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8704502602.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 21500121330610 in words is "twenty-one trillion, five hundred billion, one hundred twenty-one million, three hundred thirty thousand, six hundred ten".