21021535222124 has 24 divisors (see below), whose sum is σ = 36868954373328. Its totient is φ = 10487550075840.

The previous prime is 21021535222069. The next prime is 21021535222139. The reversal of 21021535222124 is 42122253512012.

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, 48989834 + ... + 49417070.

It is an arithmetic number, because the mean of its divisors is an integer number (1536206432222).

Almost surely, 2^{21021535222124} is an apocalyptic number.

It is an amenable number.

21021535222124 is a deficient number, since it is larger than the sum of its proper divisors (15847419151204).

21021535222124 is a wasteful number, since it uses less digits than its factorization.

21021535222124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454385 (or 454383 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21021535222124 its reverse (42122253512012), we get a palindrome (63143788734136).

The spelling of 21021535222124 in words is "twenty-one trillion, twenty-one billion, five hundred thirty-five million, two hundred twenty-two thousand, one hundred twenty-four".