21024341450402 has 4 divisors (see below), whose sum is σ = 31536512175606. Its totient is φ = 10512170725200.

The previous prime is 21024341450369. The next prime is 21024341450443. The reversal of 21024341450402 is 20405414342012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20624577362041 + 399764088361 = 4541429^2 + 632269^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5256085362599 + ... + 5256085362602.

Almost surely, 2^{21024341450402} is an apocalyptic number.

21024341450402 is a deficient number, since it is larger than the sum of its proper divisors (10512170725204).

21024341450402 is a wasteful number, since it uses less digits than its factorization.

21024341450402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10512170725203.

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 21024341450402 its reverse (20405414342012), we get a palindrome (41429755792414).

The spelling of 21024341450402 in words is "twenty-one trillion, twenty-four billion, three hundred forty-one million, four hundred fifty thousand, four hundred two".