21121315294 has 16 divisors (see below), whose sum is σ = 32147111520. Its totient is φ = 10405786720.

The previous prime is 21121315279. The next prime is 21121315301. The reversal of 21121315294 is 49251312112.

It is a super-2 number, since 2×21121315294² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203172 + ... + 289000.

It is an arithmetic number, because the mean of its divisors is an integer number (2009194470).

Almost surely, 2^21121315294 is an apocalyptic number.

21121315294 is a deficient number, since it is larger than the sum of its proper divisors (11025796226).

21121315294 is a wasteful number, since it uses less digits than its factorization.

21121315294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87635.

The product of its digits is 4320, while the sum is 31.

The spelling of 21121315294 in words is "twenty-one billion, one hundred twenty-one million, three hundred fifteen thousand, two hundred ninety-four".