21121023420402 has 32 divisors (see below), whose sum is σ = 43622870630400. Its totient is φ = 6810393186960.

The previous prime is 21121023420359. The next prime is 21121023420403. The reversal of 21121023420402 is 20402432012112.

It is not an unprimeable number, because it can be changed into a prime (21121023420403) 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, 23220708 + ... + 24113135.

It is an arithmetic number, because the mean of its divisors is an integer number (1363214707200).

Almost surely, 2^{21121023420402} is an apocalyptic number.

21121023420402 is an abundant number, since it is smaller than the sum of its proper divisors (22501847209998).

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

21121023420402 is a wasteful number, since it uses less digits than its factorization.

21121023420402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47336278.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21121023420402 its reverse (20402432012112), we get a palindrome (41523455432514).

The spelling of 21121023420402 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-three million, four hundred twenty thousand, four hundred two".